DIPTEKA. 223 



Three specimens. Four others, from Chilpancingo and Mexico city, have the wings 

 very much lighter-coloured, only lightly tinged with brownish ; they doubtless belong 

 to the same species. 



DILOPHUS (p. 4). 



Dilophus melanarius (p. 4). 



To the localities given, add : — Mexico, Orizaba (H. H. Smith & F. B. Godman), 

 Fortin and Atoyac in Vera Cruz, Amula and Rincon in Guerrero, Cuernavaca in 

 Morelos (//. II. Smith), Mexico city (F. B. Godman), Jalisco (Schumann). 



Twelve specimens, agreeing well with the description. 



3. Dilophus minutus. 



Dilophus minutus, Bellardi, Saggio etc., App. p. 7 '. 



Eab. Mexico, Orizaba (H. II Smith & F. B. Godman), Tuxpango (Sumichrast 2 ). 



Three specimens. The anal cell in this species is very distinctly closed at some 

 distance from the margin of the wing. I suspect that B. minutus is identical with 

 D. stigmaterus, Say. This and the following species were placed by Osten Sacken in 

 his list of the unidentified Mexican Bibionidae (antea, p. 5). 



4. Dilophus orbatus. 



Bibio orbatus, Say, Journ. Acad. Phil. iii. p. 77*. 



Dilophus orbatus } Wiedem. Aussereur. zweifl. Ins. i. p. 77 2 ; Bellardi, Saggio etc. i. p. 19 \ 



Hah. North America, Pennsylvania 1 . — Mexico (Truqui, Salle 1_3 ), Orizaba (Saussure 3 , 

 II. H. Smith, & F. D. Godman), Santiago Iscuintla in Jalisco (Schumann), Mexico city 

 (Schumann, F. D. Godman), Chilpancingo in Guerrero (H. H. Smith). 



One female and eleven males. The female agrees well with the descriptions. 

 I have not compared it with specimens from the United States. The males are 

 somewhat smaller and have the wings whitish, without stigma. 



SIMULIIDiE (p. 5). 



SIMULIUM (p. 5). 

 Osten Sacken (antea, p. 5) enumerated three species of this genus as described from 

 Mexico, all of which were unknown to him and therefore not numbered. The 

 following has since come to hand : — 



l. Simulium argus. 



Simulium argus, Willist. North-Amer. Fauna, vi. p. 253 l . 



flab. North America, California, Argus Mountains l . — Mexico, Omilteme in 

 Guerrero 8000 feet (II. H. Smith). 



