69 
C. H. TYLER TOWNSEND — BIOGEOGRAPHY OF MEXICO, ETC. 
16. Stelis costalis Cress. — West Fork, July. Described from Texas. 
“Found at Santa Fe.” (Ckll.) 
17. Coelioxys n. sp., near edita Cress. — West Fork, July. Mr. Fox 
does not know this species, which is doubtless new. C. edita is from 
Texas. Another species of Coelioxys , not yet identified, was also taken. 
18. Monumeiha borealis Cress. — West Fork, July. This is the first 
record in Flew Mexico for this northern species, which occurs in British 
America and the northern United States. 
19. Anthidium gilense Ckll. n. sp. — West Fork, July. 
20. Megachile brevis Say. — West Fork, July. Found in Canada and 
the United States generally. 
21. Megachile exilis Cress. — West Fork, July. Found in the United 
States generally to Lower California. 
22. Megachile fortis Cress. — West Fork, July. Found in Colorado, 
Kansas, and Texas. 
23. Megachile fidelis Cress. — West Fork, July. Found in Colorado, 
Nevada, Oregon and California. “A striking species not known in the 
Mesilla Valley.” (Ckll.) 
24. Melissodes montana Cress. — West Fork, July. Occurs in Colorado 
and New Mexico. 
25. Melissodes pallidicincta Ckll. n. sp. — West Fork, July. “Also 
found at Santa Fe; and common at Pinos Altos in Grant County.” (Ckll.) 
Pinos Altos is in the mountains to the south of the Gila Headwaters. 
26. Melissodes gilensis Ckll. n. sp. — West Fork, July. “Also found 
at La Tenaja, near Santa Fe.” (Ckll.) 
27. Xenoglossa patricia Ckll. — On the Gila at Lyons’ ranch, Grant 
County (collected by Prof. J. D. Tinsley, August, 1896). “Found in 
Mesilla Valley, and also in Arizona.” (Ckll.) This is the only species 
in the list not collected by the writer. 
It may be added that Pompilus ferrugineus Say $ , and Glypta variipes 
Say 9 ? both common United States species, were taken on the West 
Fork in July, and have been determined at the United States Depart- 
ment of Agriculture by Mr. Ashmead. It should further be said that 
many other hymenoptera were taken on the Gila Headwaters, but so 
far have been determined only generically, the genera represented being 
Psammophila, Ammophila (2 spp.), Isodontia , Bernbex (2 spp.), Eumenes 
(2 spp.), Halictus (prob. n. sp.), Epeolus, Lithurgus (?), Anthophora , and 
Bonibus. 
Other Insects. — The following five -species complete the list of de- 
terminations so far made of the Gila Insects: 
Orthezia nigrocincta Ckll. — This scale-insect was collected on a com- 
mon weed at Gila Hot Springs, 6000 feet, July 20. It is near to O. 
