188 CHIRON OMID^E. 



Abdomen black, cinereous beneath. Legs tawny, long, slender ; tarsi and 

 tips of the tibiae black. 

 Rare. (E.) 



163. obtexens, n. Fcem. canus, thorace vittis tribus nigris, alls 

 cinereis, venis halteribusque albidis, illis apud costam nigris, abdomine 

 cinereo subtus testaceo, segmentorum marginibus posticis albidis, pedibus 

 niyro-fuscis. Long. 2-|-; alar. 7 lin. 



Fern. Hoary. Thorax with three black stripes. Wings long, grey ; 

 costal, radial, and cubital veins, and discal transverse veinlet black, 

 the rest whitish. Halteres whitish. Abdomen cinereous, testaceous be- 

 neath ; hind borders of the segments whitish. Legs blackish-brown, long, 

 slender.. 



Not common. (E.) 



164. deproperans, n. Fcem. canus, thorace vittis tribus nigris, 

 alls subcinereis, venis pallide fuscis apud costam obscurioribus, halteribus 

 albidis, abdomine nigro snbtusfuscescente, segmentisjlavo-fasciatis, pedibus 

 nigris. Long. 1^-; alar. 3 lin. 



Fern. Black. Thorax hoary, with three black stripes. Wings grey- 

 ish ; costal, radial, and cubital veins, and discal transverse veinlet dark 

 brown, the other veins pale brown. Halteres whitish. Abdomen brownish 

 beneath ; a yellow band on the hind border of each segment. Legs black, 

 .stout. 



Not common. (E.) 



165. obsistens, n. Mas, canus, thorace vittis tribus vix con- 

 spicuis nigris, alis subcinereis, venis fuscescentibus apud costam nigris, 

 halteribus albidis, pedibus validis. Long. If; alar. 3 lin. 



Male. Black. Antennas with black plumes. Thorax hoary, with 

 three indistinct black stripes. Wings greyish ; costal, radial, and cu- 

 bital veins black, the other veins brownish. Halteres whitish. Legs 

 stout, moderately long. 



Not common. (E.). 



166. pertractus, n. Mas, canus, thorace vittis tribus nigris, alis 

 cinereis, venis albidis, halteribus albis, abdomine nigro-cinereo suturis 

 albidis, pedibus piceis attenuatis. Long. 2-| ; alar. 4 lin. 



Male. Hoary, slender. Thorax with three black stripes. Wings 

 grey ; veins whitish. Halteres white. Abdomen cinereous-black ; sutures 

 whitish. Legs piceous, rather long and slender. 



Not common. (E.) 



167. moturus, n. Mas et Fcem. cinereus, thorace vittis tribus 

 nigris, alis sublimpidis, venis albidis apud costam testaceis, halteribus 

 albis, abdomine nigro, segmentorum marginibus posticis cinereis, pedi- 

 bus nigris, femoribus validiusculis. Long. If ; alar. 3 lin. 



Grey. Thorax with three black stripes. Wings nearly limpid ; cos- 

 tal, radial, and cubital veins testaceous, the rest whitish. Halteres 



