ENTOMOLOGY OF COLORADO. 343 



Photopsis and Sphxrophthalma are genera inhabiting the dry regions of 

 the West, and extremely rich iu species, which are closely allied to 

 one another. Eleodes, among the Coleoptera, offers a similar instance. 

 It is difficult to account for the origin of so many species under con- 

 ditions which can hardly at any time have been very diverse. Mr. 

 Fox writes me "no species of Photopsis is known further east than 

 Colorado. P. cressoni Fox, from New Jersey, is a doubtful Photopsis. 

 Sphxrophthalma is found in all regions except the extreme North and 

 South, and is especially well represented iu the Tropics; it is not dis- 

 tinct from Mutilla." Three of the above species seem confined to 

 Colorado, but of the other three, P. alcanor extends to Arizona, P. 

 atrata to Nevada, and S. creusa to Texas. 



FORMICID^. 



435. Camponotus sylvaticus var. vicinus Mayr.* Also high-alpine. 



436. Formica fusca L., common ; Dora, March 27. 



437. " Integra Nyl,, very abundant; West Cliff, March 29; Beddoes' 



Old Eaiich, May; April 5; Dora, March 27. Also high-alpine. 



438. Formica aterrima Cr., West Cliff, common by the water-works May 25. 



439. " cillata Mayr?, West Cliff, at flowers of Yucca angustifolia. 



440. Lasius flavus DeG., West Cliff. 



441. " sp. 



442. " nig-er var. alienus Forst., West Cliff. 



443. Tapinoma sessile Say, near Swift Creek. Also high-alpine. 



Formica aterrima and F. ciliata seem confined to Colorado, but for the rest 

 the species are boreal, and three of them quite identical with Euro- 

 pean forms. F. aterrima is a conspicuous species, but Mr. Fox tells 

 me that it is still apparently confined to Colorado. F. integra is very 

 near the European F. riifa, but Mr. Fox says authorities are agreed in 

 considering it distinct. 



MYRMICID^. 



444. Pog-onomyrmex occidentalis Cr., West Cliff, July 27. 



445. Myrmica scabrinodis var. lobicoruis Nyl., Willow Creek, Aug. 27. Also 



West Cliff. 



446. Monomorium sp. 



The Pogonomyrmex is also found in Texas. 31. lobicornis is also European. 



CHRYSIDID^. 

 CHRYSIDIN^. 



447. Chrysis clara Cr., N. to Wash, and S. to Arizona and Texas. 



448. ■' pacifica Say, near Swift Creek, common. N. E. to Labrador. 



449. " lateridentata Aaron, near Swift Creek. N. to Washington. 

 4,50. " cserulans Fab., near West Cliff. E. to New Jersey (Smith) and 



N. to Vancouver. 



* C. sylvaticus Oliv. was found by Mr. Whymper at 9000 feet in Ecuador. Mr. 

 Cameron remarks that it " is very generally distributed over the old world, as 

 well as in America." 



TRANS. AM. ENT. SOC. XX. DECEMBEE, 1893. 



