DILOPHUS. 139 



Generally distributed. An autumnal species. (E. S. I.) It 

 is possible that the preceding description comprises two species, 

 for Mr. Haliday has remarked that B. dorsalis appears only in 

 woods, and that B. clavipes is common during the autumn in 

 turnip-tields, where B. dorsalis does not occur. 



Genus II. DILOPHUS. 



DiLOPHUS, Meig. Zw. i. 305 (1818) ; Mcq. ; Westw. ; Zett. Tijmla p., 

 L. ; F. E. S. ; Miill. ; Schr. ; Gmel. Hirtea p., F. Suppl. Bibio p., 

 Latr. 

 Corpus vaUdum, elongatum, mediocre. Ocelli tres. Labrum breve, 

 trigonura. Lingua lanceolata. Labium bilobatum, liirtum. Palpi 

 5-articulati, birti ; articulus primus brevis ; secundus longior ; tertius 

 adhuc longior, dilatatus ; quartus et quiutus graciles, lineares. A?i- 

 teunce \\-art'iculat(S, breves, submoniliformes, porrectfe ; articuli priino 

 ad septimura trausversi, cyathiformes ; tertius sat magnus ; octavus, 

 nonus, decimus, et uudecimus clavam fingentes ellipticam. Thorax 

 subovatus. Prothorax seriebus duabus transversis pectinato-deaticu- 

 latis. Alae sat latee, non elongataj. Halteres longi. Abdomeu 

 9-annulatum, thorace lougius. Pedes vaKdi ; tibiaj auticaj extus bi- 

 spinosaj, apice bicalcaratae. Mas. Corpus pilosum. Caput latum, 

 rotundatum. Oculi maximi, hirti, supra connexi. Abdomeu angus- 

 tum. Fcem. Corpus fere glabrum. Caput ovatum, augustum. Oculi 

 parvi, remoti, uudi. Abdomen latius. 



Body stout, elongate, of moderate size. Ocelli three. Labrum short, 

 trigonate. Lingua lanceolate. Labium bilobed, hairy. Palpi five-jointed, 

 hairy ; first joint short ; second longer ; third still longer, dilated ; fourth 

 and fifth slender, linear. Antennae eleven-jointed, short, submoniliform, 

 porrect ; joints from the first to the seventh transverse, cyathiform ; tliird 

 rather large ; eighth, ninth, tenth, and eleventh forming an elliptical 

 club. Thorax nearly o\al, with two transverse ridges in front. Wings 

 of moderate size ; costal vein ending at hardly in front of the tip of 

 the wing ; subcostal and mediastinal veins ending at beyond half the 

 length, the latter slight ; radial ending a little beyond the subcostal ; 

 cubital proceeding from the angle formed by the prajbrachial trans\erse 

 veinlet, joining the costal before the tip of the latter ; subapical forked 

 at a little before two-thirds of the length of the wing; prajbrachial 

 emerging from the subanal at a little beyond two-thirds of the length 

 of the wing, ending at nearer to the subapical than to the subanal, 

 connected by an oblique transverse veinlet with the fork of the sub- 

 apical ; anal and axillary veins imperfect. Halteres rather long. Ab- 

 domen with nine segments, longer than the thorax. Legs moderately 

 stout ; fore tibia) with two spines on the outer side, and with two apical 

 spurs ; joints of the tarsi from tlie first to the fourth successively de- 



