THE CANADIAN ENTOMOLOGIST. 155 



brown, twice as long as last segment, basal half thicker, with a knee 

 below, apical half cylindrical, rounded on tip, with a brush of black hairs 

 below ; seen from besides the basal half is triangular, going downward, 

 the apical half straight horizontal. Abdomen of female a little shorter 

 and thicker ; last segment below with black hairs, and split in the middle ; 

 on each side with a yellow cylindrical appendage as long as segments ; 

 legs short, hairy, fuscous ; tibise yellowish, annulated with black, or some- 

 times black annulated with yellow ; spurs brown, dilated, the tip broken 

 down suddenly in a right angle ; tarsi black, apical joint yellow ; claws 

 brown, incurved. Wings hyaline, a little acuminate, veins and veinlets 

 alternately yellow and black ; pterostigma small, indistinct, blackish ; 

 costal space with one series of areoles ; hind wings a little shorter, veins 

 not so much spotted ; the males at base with a small yellowish pelote. 



Long, of body, 36 to 38 m.m.; exp. alar, 70 to 80 m.m. 



Hab. — The types (now destroyed) were four females from Pecos 

 River, Western Texas (now N. Mexico), collected in July on Capt. Pope's 

 Expedition ; one specimen of the same lot is still present in Mr. Uhler's 

 coll. I have now before me a dozen specimens, half females, one from 

 Oregon by Mr. H. Edwards, and all others from Ainsworth, Wash. Terr., 

 July 20, coll. by Mr. S. Henshaw, Ainsworth, a town, then only a few 

 months old, is situated in the middle of a sandy desert just near the 

 Columbia River and mouth of Snake River. The little inn where we 

 had to stay showed the windows and window-sills covered Avith Myrme- 

 leons, all of a very sluggish temper. A. congene?- was common. One 

 male was collected the day before, July 19, on the Big Bend of the 

 Yakima River. 



About the supposed larva of this species described by me long ago, I 

 have to speak later. 



The species of Acanthaclisis described here are the only ones known 

 to exist in N. America. 



10. Myrmeleon giclo Burm. 



The type of Burmeister, vol. ii., p. 997, No. 18, from Senei.-'ambia, in 

 Winthem's collection, has been carefully compared by me. Burmeister 

 quotes M. giilo Dalman, Analecta., p. 89, No. 101, but neither the label 

 nor the description give any surety that the specimen had been sent by 

 Dalman as his type, the more so as this is stated for the following species 

 in Burm. Handb., M. Hyaaia. The type of the latter is now with 



