210 DIPTEBA. 



brown stripes on the front side and dark brown dots at the tips ; the tips of the tibiae 

 and of all the tarsal joints infuscated; the four anterior coxa? grey-pollinose and beset 

 with white hairs, the hind coxae reddish. Wings greyish-hyaline, purer hyaline towards 

 the root. Two specimens. 



N.B. — In all the essential characters this species is allied to the typical forms of 

 Neomochtherus, e. g. the European K pallipes, Macq., and K striatipes, Loew ; it very 

 much resembles the former species in colour, but is larger. The most marked difference 

 consists in the male forceps being not so swollen as in these two species. Loew, how- 

 ever, did not regard this character as essential, as he provisionally placed N. castanipes 

 in the same genus. The latter species is much more aberrant than N. plebeius ; it has 

 four macrochsetse on the scutellum, while A 7 ", plebeius and the two above-mentioned 

 European species have only two ; the legs are more bristly, &c. The ovipositor of 

 N. plebeius is also shorter and broader than that of 2T. pallipes and N. striaticeps. 



The following species of Asilus, in a wider sense, have been described from our 

 region by previous writers : — 



Asilus apicalis, Bellardi, Saggio &c. ii. p. 57. — Mexico. 



inamatus, Walker, Trans. Ent. Soc. Lond. n. ser. v. p. 283. — Mexico. 



infuscatus, Bellardi, 1. c. p. 56. — Mexico. 



megacephalus, Bellardi, 1. c. p. 58. — Mexico. 



mexicanus, Macq. Dipt. Exot. Suppl. ii. p. 94. — Mexico. 



perrumpens, Walker, 1. c. p. 283. — Mexico. 



(Philonicus) tceniatus, Bellardi, 1. c. p. 55. — Mexico. 



( ) tuxpanganus, Bellardi, 1. c. App. p. 22. — Mexico, Tuxpango. 



(Lophonotus) humilis, Bellardi, Saggio &c. ii. p. 51. — Mexico. 



(MochtherusV) fuliginosus, Bellardi, 1. c. p. 52. — Mexico. 



(Mochtherus) truquii, Bellardi, 1. c. p. 52. — Mexico. 



(Epitriptus 1) albo-spinosus, Bellardi, 1. c. p. 54. — Mexico. 



(Epitriptus) niveibarbus, Bellardi, 1. c. p. 53. — Mexico, Cordova. 



OMMATIUS. 



Ommatius, Wiedemann, Dipt. Exot. i. p. 213 (1821). 



1. Ommatius peregrinus, sp. n., <y . 



Thoracic dorsum dull brown ; abdomen red ; legs yellowish-red, the hind femora and tibiae with brownish rings 



in the middle ; wings hyaline, with a grey shade on the apex. 

 Length 15 millim. 



Hab. Panama, Bugaba 800 to 1500 feet (Champion). 



Face orichalceous pollinose ; facial tubercle but little projecting, beset with golden 



