DI.LOPIIUS. 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-fields, where B. dorsalis does not occur. 



Genus II. DILOPHUS. 



DILOPHUS, Meig. Zw. i. 305 (1818) ; Mcq. ; Westw. ; Zett. Tipula p., 

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

 Latr. 



Corpus validura, elongatum, mediocre. Ocelli tres! Labrum breve, 

 trigonum. Lingua lauceolata. Labium bilobatum, hirtuin. Palpi 

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

 adlmc longior, dilatatus ; quartus et quiutus graciles, lineares. An- 

 tenna \\-artic ulatcE, breves, subinoniliformes, porrecta? ; articuli primo 

 ad septirnum trausversi, cyatlii formes ; tertius sat magnus ; octavus, 

 nonus, deciiuus, et imdecimus clavam fingentes ellipticam. Thorax 

 subovatus. Prothorax seriebus duabus transversis pectinato-deuticu- 

 latis. Alae sat lata?, non elongatae. Halteres longi. Abdomeu 

 9-annulatum, thorace longius. Pedes valid! ; tibiae autica? extus bi- 

 spinosse, apice bicalcaratse. Mas. Corpus pilosum. Caput latum, 

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

 tum. Fcem. Corpus fere glabrum. Caput ovatura, angustum. Oculi 

 parvi, remoti, nudi. 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. Antenna? eleven-jointed, short, submonililbrai, 

 porrect ; joints from the first to the seventh transverse, cyathiibrm ; third 

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

 club. Thorax nearly oval, 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 praebrachial transverse 

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

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

 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 subaual, 

 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 the first to the fourth successively de- 



