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298 Journal New York Entomological Society. [Vol. xxvii. 

THE BEES OF PEACEFUL VALLEY, COLORADO. 

By T. D. A. Cockerell, 
Boulder, Colo. 

During the last week of August, 1918, having no holiday this sum- 
mer, my wife and I ventured to retire for four days to Peaceful Valley, 
in the mountains of Boulder County. It is a deep valley running east 
and west, with steep wooded sides, the altitude at the bottom about 
8,000 feet above sea level. The biota is characteristically boreal, the 
plants including such genera as Linncea, Pyrola, Achillea, Anten- 
naria, Dasytephana, Vaccinium, Arnica, Veronica, etc. It is above 
the zone of sun-flowers, but a solitary Helianthus lenticularis, of 
small stature, had developed from some accidentally dropped seed, 
and was blooming cheerfully. Weeds are not very abundant, but 
there is a large patch of Gartneria tomentosa (Nutt.) Heller. The 
principal bee-flowers were found to be Phacelia heterophylla Pursh 
and Heliomeris multiflora Nuttall ; they are cited below by the generic 
names only. At one spot, patches of Phacelia, Heliomeris and Mo- 
narda grew close together, and it was interesting to note that their 
bee-visitors were almost all different. Galls of Rhodites tuberculator 
Ckll. were found on the roses. The common butterflies included 
Basilarchia weidemeyeri Edw., Euvanessa antiopa L., Pieris rapes 
L., Eurymus alexandra Edw., etc. Few moths were caught; the most 
interesting were Autographa angulidens Smith and Crambidia casta 
Sanborn. The coccid Orthezia occidentalis Dougl. was common; it 
seems to be specially attached to Fragaria. Among wasps the curious 
Crabro latipes Smith was taken. The bee-fauna proved unusually 
interesting, including the following species : 

Prosopis gaigei Ckll. 2 5, at Phacelia (W. P. Cockerell). New 
to Colorado. 

Prosopis elliptica Kirby. 1 $, Aug. 27. 

Andrena apacheorum Ckll. 1 5, Aug. 25. 

Halictus cressonii Rob. Both sexes ; all at flowers of Heliomeris, 
except one female from Phacelia. 

Halictus ruidosensis Ckll. Both sexes. Male at Phacelia (W. 
P. C). 



Dec, I9I9-] COCKERELL: BeES OF PEACEFUL VALLEY. 299 

Halictus euryceps Ellis. 2 5, at Phacelia, Aug. 26 (W. P. C). 

Halictus hemimelas Ckll. 1 5, Aug. 25. New to Colorado. The 
abdomen is strongly brassy-greenish; the type, from New Mexico, 
has the abdomen faintly bronzy or greenish. In all other respects, 
the Colorado specimen agrees with hemimelas, and I am confident 
that it is the same species. 

Halictus synthyridis Ckll. 1 <-f. 

Halictus (Chloralictus) phaceliarum new species. 

Female. — Length about 6.5 mm. ; robust, with broad head, and eyes not 
much converging below ; face and front olive-green, the front dull and granular, 
clypeus mainly black ; cheeks and metathorax blue-green, the latter shining, 
with a steely lustre, with minute punctures, sparse on disc ; antennas dark, the 
flagellum partly red beneath toward apex ; hair of face and thorax above 
tinged with yellow, of cheeks and pleura clear white ; area of metathorax 
large, with an oblique raised line at sides; surface of area with delicate but 
conspicuous plicae, complete at sides, but in middle weak and running into a 
reticulation which does not reach the hind margin ; tegulae smooth, brownish 
black; wings very faintly grayish, stigma and nervures pale dull reddish- 
testaceous ; legs black, tarsi brownish at apex ; hind spur with long spines ; 
abdomen polished, black (including hind margins of segments), not at all 
metallic; third and following segments (third sparingly on disc), and sides 
of second, covered with grayish pruinose pubescence. 

Peaceful Valley, Colo., Aug. 26, 1918, at flowers of Phacelia, col- 
lected by W. P. Cockerell. 

Variety a. Mesothorax olive green; wings slightly reddish. 

Peaceful Valley, Aug. 27 (T. D. A. Cockerell). 

Closely related to H. subconnexus Ellis, but the sculpture of meta- 
thoracic area is much more delicate, the eyes converge less below, and 
the abdomen is without metallic tints. 

There are also in the collection several small species of Halictus 
represented only by males. They do not agree with any identified 
males, but they may have been described from females, as numerous 
species are known only in that sex at present. 

Calliopsis coloradensis Cresson. 1 J, Aug. 27, at Chrysopsis. 

Perdita affinis Cresson. 1 <j>, Aug. 27, at Chrysopsis. 

Panurginus porters Ckll. 2 g, Aug. 26, at Heliomeris. 

Halictoides oryx Viereck. Both sexes ; females at Heliomeris. 

Pseudomelecta interrupta rociadensis Ckll. One, Aug. 26. 



300 Journal New York Entomological Society. C Vo1 - xxvii. 

Triepeolus helianthi pacificus new subspecies. One male, Aug. 26 
(W. P. Cockerell). 

I find that the western forms related to T. helianthi are at least 
subspecifically distinct; the differences are indicated in the following 
table : 

Triepeolus Robertson. 

About 10 mm. long, with a delicate median line on clypeus 1 

Much larger; about 13 mm. long, anterior wing 9.5 mm.; no trace of a line on 
clypeus ; anterior margin of pleura below transverse band hairy ; sides of 
front above with a small punctureless area, but it is not highly polished. 
(Both sexes, the male the type, at flowers of Cirsium acaulescens, Floris- 
sant, Colo., July 29, collected by S. A. Rohwer; also a female collected 
by W. Porter near San Ignacio, New Mexico) . .grandior new subspecies. 
1. Anterior margin of pleura below the transverse band without hairs; upper 

part of front at sides without shining spaces (Illinois) helianthi Rob. 

Anterior margin of pleura below the transverse band broadly hairy ; upper 
part of front on each side with a smooth polished space. 

pacificus new subspecies. 

Melissodes grindelise Ckll. Females ; one at Grindelia. 

Anthophora montana Cresson. Females; one at Monarda (W. 
P. C). 

Anthophora smithii Cresson. 1 g, at Monarda (W. P. C). 

Anthidium emarginatmn Say. Both sexes at Phacelia, abundant 
(W. P. C). 

Anthidium porters Ckll. 1 J, Aug. 27. 

Osmia fulgida Cresson. Females common at Phacelia (W. P. C). 

Osmia armaticeps Cresson. One female at Phacelia, Aug. 26 (W. 
P. C). 

Osmia wardiana Ckll. One female at Phacelia, Aug. 26 ( W. P. C.) . 

Osmia copelandica Ckll. Four females at Phacelia, Aug. 26 (W. 
P. C). 

Monumetha albifrons Kirby. One female at Phacelia, Aug. 26 
(W. P. C). 

Bombus juxtus Cresson. Workers at Phacelia and Helianthus 
lenticular is. 

Bombus bifarius Cresson. Worker at Heliomeris, Aug. 26. 

On the way to and from Peaceful Valley, we had occasion to spend 
a few hours at Puzzler, alt. 8,700 feet. The bees caught here were 
Anthidium tenuiflorae Ckll., Melissodes grindelise Ckll., Megachile rela- 
tiva Cresson, and a few others not yet examined.