ENTOMOLOGY OF COLORADO. 



339 



369. Coelioxys coloradensis Cr.. uear Swift Creek. 



Megachile has twenty Colorado spp. ; M. perhrevis is also in Texas ; M. 

 bticephala is boreal and western. Anthidium has twelve Colorado 

 spp. ; A. parvum is also in Oregon. 3fon. boreaUs, the only U. S. species, 

 is boreal and widely distributed. Osmia, with twenty-five spp. in 

 Colorado, presents a good example of the development of numerous 

 species within the limits of an old and widely distributed genus. All 

 of the above mentioned species seem to be, so far as known, confined 

 to Colorado. Coelioxys has nine Colorado spp. ; C. coloradensis seems 

 confined to Colorado. 



NOMADIN^. 

 370. BomDomelecta thoracica Cr. West Cliff. May 19. 



37L Nomada americana var. valida Cr. West Cliff, May 24, at flowers of 

 Erigeron radicatus. 



372. Nomada' parata Cr. West Cliff, May 19; some have the ends of the an- 



tenufe reddish, some have not. 



373. Nomada fragilis Cr. West Cliff, May 19. 



374. " morrisoni Cr. West Cliff, May 19. 



375. Panurgus flmbriatus Cr. West Cliff, May 19, and May 25. 



376. " rufocinctus Ashm. West Cliff. Hym. Colorado* p. 4. 

 377" " andrenoides Cr. West Cliff, May 19, at willow blossom. 

 378. " marg-inatus Cr. West Cliff, May 19. 



Bomb, thoracica, the only species of its genus, at least in N. America, is 

 western. Nomada has twenty-six Colorado spp. ; N. americana is bo- 

 real, but the other three in the list seem confined to Colorado. Pan- 

 urgus and Nomada are also European ; the Colorado spp. of the latter 

 genus are only seven in number; of the above {our, fimbriatus and 

 rufocinctus seem only known from Colorado; andrenoides is also in 

 Texas, and marginatus is recorded from Kansas. 



ANDBENID-S. 

 ANDRENIM^. 



379. Megacilissa monticola Ashm. MS.; see 10th Eep. Colo. Biol. Ass'n. 



380. Cilissa trizonata Ashm.. Hym. Colo. p. 6. 



381. " erythrogaster Ashm., Hym. Colo. p. 6. 



382. " nigrihirta Ashm., Hym. Colo. p. 6. 



383. " albihirta Ashm., Hym. Colo. p. 5. 



384. Nomia nortoni Cr. West Cliff, on flower of Yucca angustifolia. Also 



high-alpine, at timber line. 



385. Andrena sp. West Cliff, May 24. 



Megacilissa is quoted in Cresson's catalogue only from Georgia ; but Mr. 

 Fox informs me that there are two species in Mexico, and one in N. 

 Mex. Cilissa has only one United Slates species, according to Cresson's 

 work, but probably several exist; the genus is also European. Our 

 four species are only known from Colorado. Nomia nortoni extends 



« Hym. Colo. = Ash mead ; on the Hymenoptera of Colorado. Bull. 1, Colo. 

 Biol. Assoc, 1890. 



TBANS. AM. ENT. .SOC. XX. DECEMBER, 1893. 



