82 DIPTEEA. 



that I do not perceive the silvery longitudinal stripes of the abdomen mentioned 

 by me (I. c). 



Two specimens from Tehuacan, Mexico (Sumichrast, coll. Bellardi), seem likewise to 

 belong here ; only one of them, marked as the female (I cannot make out the sex in 

 its present dilapidated condition), has a pair of white spots on each of the segments 

 5 to 7, forming two converging rows. Thus the abdomen of this specimen answers the 

 description I have given of the abdomen of E. dorcadion ('Western Diptera,' p. 232)> 

 while the wings answer better the description given there of the wings of JE. caliptera. 

 In the absence of my original specimens I cannot solve this difficulty, the more so as I 

 did not mention in my description the sex of the specimens I had before me. Was I 

 wrong in separating JE. dorcadion I and is it merely the female of JE. caliptera X 



2. Exoprosopa pueblensis, s $ . 



Exoprosopa pueblensis, Jaennicke, Neue exot. Dipt. p. 34, t. 2. f. 21. 



Edb. Mexico, Tehuacan {Sumichrast) ; Guatemala, San Geronimo [Champion). 



Two male and two female specimens from Tehuacan, in Bellardi's collection. A 

 specimen from San Geronimo, Guatemala, has much darker legs. Two smaller 

 specimens (14 millim.), from Ciudad in Durango, Mexico (Forrer, 8000 feet altitude), 

 and from Northern Sonora (Morrison), represent a closely allied, if not the same 

 species; the brown spot at the proximal end of the second posterior cell is small, 

 and disconnected from the rest of the brown. 



JE. eremita, O. Sack., West. Dipt. p. 256, from Northern California, must be a closely 

 allied species ; in the absence of specimens I cannot say much about it. Judging from 

 the description, it has the proximal end of the marginal cell hyaline, and differently 

 coloured hairs on the body. 



JE. (Anthrax) ignifer, Walk. List &c. ii. p. 243 (Jamaica), has the same venation and 

 the same distribution of the spots on the wings, but the body and the hairs upon 

 it are more rufous. I am unable to tell whether it is a different species, or merely a 

 local variety. 



3. Exoprosopa iota, sp. n., 8 $ . (Tab. I. fig. 13.) 



Pattern of the wings of the type of E. (Anthrax) fascipennis, Say, but with the expanded portion of the marginal 

 cell hyaline ; an isolated brown spot at the proximal end of the second posterior cell ; first posterior 

 cell closed, petiolate. 



Length 7-9 millim. 



Hah. Mexico, Tehuacan (coll. Bellardi). 



The three specimens ( 6 $ ) in Prof. Bellardi's collection are in a very indifferent 

 state of preservation and rather abraded ; however, the venation and the pattern of 

 the wings render them easily recognizable. 



Face conically protruding ; face and front black, with appressed, scale-like golden 



