C. H. TYLER TOWNSEND — BIOGEOGRAPHY OF MEXICO, ETC. 79 
14. Phidippus n. sp. (Peck.). — Reynosa, Tamaulipas, May 16. 
15. Zygoballus prob. bettini Peck. — April (immature). Z. bettini is 
known from Wisconsin, Missouri, Georgia, and Florida. 
Ixodidae. — The following are ticks determined by the Department 
of Agricnltnre: 
1 . Argas americana Pack. — Found abundant in the hen houses at San 
Diego, Texas, December 6, 1894. Said to be nocturnal in habits. 
2. Boophilus bovis Riley (?). — Very bad on horses in pastures. Feb- 
ruary. 
3. Dermacentor americanus Linn. — Taken from a coyote shot near 
San Tomas, February 28. One which seems to be this species was taken 
on a horse, March 13. 
4. Ixodes sp. (?). — Very numerous in the brush, from February on 
through the season, both the newly-hatched ones ( pinolillos ) and the 
adults ( garrapatas ). These are among the pests of the tropics, getting in 
great numbers on the clothing and person of any one who is hardy 
enough to venture into the woods and fields. Their occurrence here in- 
dicates with certainty the presence of a tropical element in the fauna. 
Ophidia. — Two species of snakes/collected in 1892 by Mr. Frank B. 
Armstrong, and determined by Mr. Carl F. Baker, are Lutainia proximo 
Say, taken July 20; and Lutainia vagrans B. & G., taken July 23. 
Molltjsca. — Some terrestrial mollusca were collected also, and sent to 
the Department of Agriculture. They were referred to Prof. Wm. IT. 
Dali, who has determined them as follows: 
1. Bulimulus alternatus Say var. — On stems and branches of Pro- 
sopis juliflora. Found plentifully on mesquite from El Sauz, Texas, to 
the Rio Grande. 
2. Helicina orbiculata var. tropica Jan. — In ground at Santa Rosalia, 
March 13. Shell only. 
3. Polygyra texasiana Mor. — In earth at Santa Rosalia, March 13. 
Shell only. 
4. Praticolella griseola Pfr. — On ground at Santa Rosalia, March 13. 
Shell only. Also taken at Tampico, and San Rafael, Vera Cruz. 
5. Succinea luteola Gould. — Alive on Prosopis juliflora and Mimosa , 
March 11. Santa Rosalia and above Brownsville. 
Note. — The coleoptera which I collected on the lower Rio Grande form 
quite an extensive lot of material, which was all sent to the Department 
of Agriculture. A portion of the species has been determined, and will 
be published soon as a first installment of a separate paper, 
