CEUATOPOGON. 215 



17. halteratus, Winn. ! Linn. Ent. vi. 28. 17. pi. 4. f. 17 (1852). 

 Mas, ater, antennarum pluraa apice albo-nitente, thorace nitido, alis 

 hyalinis nigro-cinereo-pilosis, venis pallidis apud costam fuscescentibus, 

 vena costali setosa, halteribus apice lacteis, abdomine nigro-fusco, pilis 

 nigro-cinereis, pedibus albido-pilosis, femoribus piceis, tibiis pallidioribus, 

 tarsis albidis. Long, f; alar. 1 lin. 



Male. Black. Plumes of the antennre glistening-white towards the 

 tips. Thorax deep black, shining. Wings hyaline, with blackish-grey 

 hairs ; veins pale, brownish towards the costa ; costal vein setose. 

 Halteres with the apical half of the club milk-white. Abdomen blackish- 

 brown, clothed with blackish-grey hairs. Legs clothed with long whitish 

 hairs ; femora piceous ; tibiae paler ; tarsi whitish ; tips of their joints 

 darker. 



Not common. (E.) 



18. velox, Winn. ! Linn. Ent. vi. 28. 18. pi. 4. f. 18 (1852). Fcem. 

 niger, obscurus, nigro-hirtus, alis hyalinis nigro-hirtis, vena costali valida 

 obscure nigra, halteribus albis nigro-petiolatis, pedibus piceis, tarsis fla- 

 vescentibus. Long. ^ ; alar. 1 lin. 



Fern. Slack, not shining, clothed with black hairs. Antennae brown, 

 with black hairs, those of the last five joints glistening-white ; five 

 basal joints cylindrical, the three following more oval, the fifth apical, 

 long, elliptical. Wings hyaline, clothed with black hairs; costal vein 

 thick, black. Halteres with white knobs. Hairs of the abdomen and 

 of the legs glistening-hoary. Legs piceous ; tarsi yellowish. 



Rare. (E.) 



19. frutetorum, Winn. ! Linn. Ent. vi. 29. 19. pi. 4. f. 12 (1852). 

 Mas et Fcem. niger, thorace subnitido albido-pubescvnte, alis hyalinis 

 albido-hirtis, venis pallidis apud costam fuscescentibus, halteribus apice 

 albis, abdomine obscure nigro-fusco albido-piloso, pedibus pallide piceis 

 albido-hirtis, tarsis pallidioribus; Mas, antennarum plumis albidis ; 

 Fcem. antennis albo-pilosis. Long, -i ^ ; alar. -| lin. 



Male and Fern. Black. Third and fourth joints of the palpi occa- 

 sionally yellowish. Thorax sometohat shining, covered with short whitish 

 down, which appears greyish in some aspects. Wings hyaline, appear- 

 ing glistening- white when seen on a dark surface, clothed with whitish 

 hairs ; veins pale, brownish towards the costa. Halteres with the apical 

 half, or the whole, of the club milk-white. Abdomen dull blackish-brown, 

 clothed with long whitish hairs. Legs pale piceous, furnished with long 

 whitish hairs; tarsi pale. Male. Plumes of the antennae glistening- 

 white towards the tips. Fern. Antennae with white hairs ; joints almost 

 cylindrical, closely joined together, the five last somewhat elongated. 

 Wings hardly glistening-white, their clothing generally thicker and 

 darker than that of the male. 



(E.) 



20. sylvaticus, Winn.! Linn. Ent. vi. 29. 20. pi. 4. f. 20 (1852). 



