1892] MARYLAND ACADEMY OF SCIENCES. 155 



This species closely resembles a variety of C. canicu- 

 laris Harris, from Texas and Louisiana. The types were 

 obtained in Mexico, and other specimens have been col- 

 lected in Costa Rica. 



15. C. psophis Walker, Brit. Mus. Cat. Horn. v. I., p, 153, 

 No. 92. Distant, Biol. Cent. Amer. Hom. p. 9, No. 



10, pi. 2, %. 11. 



Hitherto found only in Mexico. 



16. C. ornea Walker, Brit. Mus. Cat. Hom. v. I., p. 137, 

 No. 75. Distant, Biol. Cent. Amer.-Hom. pi. 3, fig. 3. 



At present known only from Mexico. 



17. C. transversa Walker, Ins. Saunders, Hom. p. 15, C. 



alacris. Stael, Stettin, Ent. Zeit. v. 25, p. 02. 

 The type came from Mexico. I liaA^e examined a speci- 

 men from Texas. 



18. C. hilarls Distant, Biol. Cent. Amer. Hom. p. 9, No. 



11, pi. 2, Fig. 10. 



This species belongs to the division having the narrow 

 head. Also in both form and proportions it makes an 

 approach to the genus Tihicen. It has thus far been 

 found only in Mexico. 



19. C. intermedia Distant, Biol. Cent. Amer. Hom. p. 10, 



No. 12. 

 Inhabits Mexico. Possibly this will prove to be only 

 a form of the preceding species. 



20. C. robusta Distant, Biol. Cent. Amer. Hom. p. 10, No. 

 13, pi. 2, fig. 3. 



Inhabits southern Mexico, where it seems to be quite 

 common. 



21. C. dissimilis Distant, Biol. Cent. Amer. Hom. p. 10, 

 No. 14. 



Inhabits Mexico. It is closely related to C. robusta 

 Dist., but differs principally in having much longer 

 opercula. 

 Feb. 20, '93. 



