DRAPETIS. 135 



Genus XIX. DRAPETIS. 



Drapetis, Mg. z\v. iii. 91 (1822); Mq. ; Hal.; Ct. ; Ztt. Tachj- 



dromia p., Fin. ; Mg. 

 Corpus minutissiraum, atrum, oblongo-ovatum, nitidum, glabrum. 

 Oculi hirsutuli, in utroque sexu parum remoti."" Proboscis verti- 

 calis. Palpi latl, compressi, prohoscide breviores. Antennae 4-arti- 

 culatte, capite breviores, ascendentes ; articulus tertius brevi-ovatus 

 vel rotundatus; quartus longus, setiformis. Thorax gibbus, non 

 lobatus. Ate sublata3 ; vena cub'dalis simplex; vence externo-medice 

 2 ; areola discoidalis et vena subanalis nulla ; areola prcebrachialis 

 pobrachiali multu brevior ; vena3 lougitudinales simplices ; secunda 

 brevis, incurva ; quinta in marginem intcriorem descendeus. Pedes 

 nudi, simplices ; coxcb femoribus breviores. 

 Mas. Abdomen subcyliudricum. Anus obtusus. 

 Fcem. Abdomen subovatum. Anus acutus. 



Body very small, oblong-ovate, black, smooth, shining, beset with a 

 few black bristles. Head ahnost round ; epistoma very narrow. Eyes 

 somewhat parted in both sexes. Oculi 3, on a tubercle of the crown. 

 Proboscis very short, perpendicular. Palpi broad, shorter than the 

 proboscis. Labrum long, very stout, broad-ovate and convex at the 

 base, lanceolate and curved at the tip. Palpi incumbent, large, ovate, 

 furnished with a few bristles, shorter than the proboscis. Labium rather 

 small. Antennae 4-jointed, porrect, inserted between the eyes in the 

 middle of the face, approximate at the base, diverging, curved upwards, 

 as long as the head ; first joint very short ; second slightly cyathiforni, 

 bearing a few bristles ; third short-oval or round, compressed ; foui-th 

 setiform, pubescent, as long as all the preceding, forming an angle 

 with the third. Thorax gibbous; scutellum semicircular. Wings 

 rather broad, inciunbent and parallel in repose, finely pubescent, 

 roiuided at the tips; cubital vein sitnple ; externo-medial veins 2; discal 

 areolet and subanal vein none ; prcebrachial areolet much shorter than 

 the pobrachial ; longitudinal veins simple ; second short, incurved, 

 scarcely extending beyond the middle of the fore border ; fifth de- 

 scending to the interior margin. Legs long, simply pubescent, beset 

 with a few black bristles ; coxce shorter than the femora ; femora rather 

 thick ; tibiae slender ; anterior tibiae with spines at theii* tips ; hind 

 tibiae slightly curved. 



Male. Abdomen rather long, almost cylindrical ; tip obtuse. 

 Pern. Abdomen more oval, acute. 



These flies appear from the spring to the autumn ; they run 

 with extreme rapidity, and frequent herbage, trunks of trees, hot- 

 beds, and sea-weed. In hot-beds tliey are much infested with 

 mites. The genus may be thus divided : — 

 a. Third joint of the antennae ovate. Eadial vein extended beyond 



