254 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 46. 



Wings with third costal division barely equal to one-half the length 

 of second; veins 3-4 subparallel or sometimes slightly convergent; 

 outer cross vein slightly oblique; last section of fifth vein and penulti- 

 mate section of fourth subequal. 



Length, 2-2.5 mm. 



Originally described from District of Columbia. Sometimes the 

 hind femur is slightly darkened on middle, and rarely the hind tibia. 



I have seen specimens from: Columbus, Texas, August 15; Sharps- 

 burg, Texas; Wades, Texas; San Diego, Texas; Brownsville, Texas; 

 Beeville, Texas; Floresville, Texas; Maryland (collection Coquillett); 

 Biscayne Bay, Florida (Mrs. A. T. Slosson). 



15. HIPPELATES PROBOSCIDEUS Williston. 



Hippelates (Siphomyia) proboscideus Williston, Trans. Ent. Soc. Lond., 1896, 

 p. 418. 



This species answers in practically all particulars to the description 

 given herewith for plebejus except in its possession of a small glossy 

 black spot on the triangle in front of the anterior ocellus. In the 

 description much importance is attached to the fact that the pro- 

 boscis is elongated and geniculated, the apical portion being turned 

 back for a distance a little shorter than the length of head. This is 

 also the case in nohilis and plehejus. There is nothing in the descrip- 

 tion except the character above mentioned by means of which it 

 may be separated from i)lebejus. 



Locality. — St. Vincent, West Indies. 



16. HIPPELATES NOBILIS Loew. 



Figs. 18, 38. 



Hippelates nohilis Loew, Dipt. Amer. Sept. Ind. Cent., 3, 1863, species 67. 



This species is very similar in most respects to plehejus Loew, 

 but has the glossy spots on the frons more or less distinct, and the 

 hind femora and tibiae have a distinct black ring on middle. In a 

 series of specimens from Duncan, Oklahoma, July, 1909 (T. D. 

 Urbahns), the frons is much narrower; the triangle reaches short 

 of middle of frons; the cheeks are comparatively higher, and their 

 anterior margin more protruding; the scutellum is less broadly 

 yellow, the abdomen consistently with fore marginal bands on all 

 segments except the basal two; and the hind tibiae have in all cases 

 a very distinct middle band. The hind metatarsus also seems to be 

 less distinctly attenuated at base. 



I have examined one specimen in U. S. National Museum collection 

 labeled "N. C." which differs from the series from Oklahoma in 

 having no pale color on thorax, in having the abdomen with only 

 narrow, hind marginal, yellow bands. In other respects as 



