226 CHIHONOMIDjE. 



black ; third whitish at the base. Male. Plumes of the antennae with 

 glistening- white tips. Ungues short and slender. Plantae with short 

 slender spines. Fern. First and second joints of the palpi often yellow, 

 or pale brown. Antennae occasionally yellow towards the base ; joints 

 from the first to the eighth cylindrical, almost oval; from the ninth 

 to the thirteenth much elongated, elliptical; first joint twice the length 

 of the second. Abdomen more obscure, and much contracted at the 

 base, where as well as at the tip and on the hind borders of the seg- 

 ments there are a few glistening-whitish hairs ; underside with a large 

 subapical tuft of longer black hairs. Ungues stout, long. Plantae 

 beset with five or six pairs of stout spines. 



Generally distributed. (E. S. I.) 



Stseger remarks that immediately after pairing the male is the 

 prey of the female, whicb holds its partner with its strongly armed 

 fore-legs, and inserts its proboscis deep into the peristoma, or the 

 opening of the mouth. 



50. flavirostris, Winn.! Linn. Eut. vi. 52. 50. pi. 7. f. 50 (1852). 

 Mas et Fcem. niger, nitidus, capite antice subtusque, pectorisque lateribus 

 anticis Jlavis, alls limpidis, venis pallidis, halteribus niveis petiolis albidis, 

 pedibus albo-flavis,femoribus at tibiis posticis tarsorum posticorum articu- 

 lis apice nigris ; Mas, palpis pallid e-fuscescentibus, antennis nigris, abdo- 

 minis apice Jlavo ; Fcem. palpis nigro-fuscis, antennis albidis apices versus 

 fuscescentibus. Long. 1 ; alar. 2 lin. 



Male and Fern. Black, shining. Head in front and beneath, proboscis, 

 fore sides and fore border of the pectus, and a sti'eak by the base of each wing, 

 yellow. Wrings limpid ; veins pale. Halteres whitish, with snow-white 

 knobs. Legs whitish-yellow ; tips of the hind femora, of the hind tibiae, 

 and of the joints of the hind tarsi, black. Ungues slender, without teeth. 

 Male. Palpi pale brown, very large. Antenna black, with black plumes ; 

 tips of the latter glistening-white. Abdomen with yellow forceps. 

 Fern. Palpi blackish-brotvn. Antenna whitish; first joint cylindrical, 

 twice the length of the second ; the seven following joints more oval, 

 somewhat contracted in the middle; the five last brownish, elongated, 

 cylindrical. Hind femora blackish-brown for some space from their tips. 



(E.?) 



51. illustris, Winn.! Linn. Ent. vi. 53. 51. pi. 7. f. 51 (1852). 

 Fcem. albo- aut flavido-cinereus, capite postico nigro-fusco, proboscide 

 palpisque Jlavis aut pallide fuscis, antennis pallide Jlavis apicibus fuscis, 

 thorace lineis punctisque purpureo -fuscis, scutello Jlavo vittis quatuor 



fuscis, pectore et metathorace nigro-fiiscis, hoc subtusjlavo-marginato, alls 

 subfuscescentibus, venis nigro-fuscis, abdomine nigro-fusco-nitido, pedibus 

 nigro-fuscis, tarsis Jlavis, femoribus tibiisque posticis incrassatis. Long, 

 f ; alar. If lin. 



Fern. Head ivith some glistening -white marks arranged in the form of 

 a cross behind the crown ; hind part blackish. Proboscis and palpi yel- 

 low or pale brown ; joints of the latter very long ; second, third, and 



