THRYPTOCERA.—LASIONA. 127 
THRYPTOCERA. 
Thryptocera, Macquart, Suites 4 Buffon, Diptéres, ii. p. 87. 4 (1835). 
In the collection of Professor Bellardi in Turin are three specimens from Mexico, 
which undoubtedly belong to this genus. They have quite the aspect of the.European 
forms. Two of them seem to belong to the same species; in these the frontal band, 
the basal joints of the antenne, the palpi, scutellum, abdomen, and legs are rufous; the 
thorax is cinereous;. the wings are slightly brownish; the first vein is bristly over its 
whole length, the third only as far as the small cross-vein, which is placed on the middle 
of the discal cell; and the posterior cross-vein is inserted in the middle between the 
small cross-vein and the curvation of the fourth vein. Their length is 4°5 millim. 
The third specimen seems to belong to a distinct species, as it is much smaller 
(3 millim.), and has the third antennal joint broader. 
The somewhat imperfect preservation of the specimens does not permit me to give a 
full description of them ; but it is necessary to state that the genus Thryptocera has its 
representatives in Central America. For the present I prefer to leave them thus :— 
1. Thryptocera —— ? 
Hab. Mexico (coll. Bellardi). 
2. Thryptocera —— ? 
Hab. Mexico (coll. Bellardi). 
LASIONA, gen. nov.* 
Eyes hairy. Cheeks narrow; no facial bristles. Antenne nearly as long as the face; third joint at least 
three times as long as the second; proboscis and palpi prominent. Abdomen ovate ; first segment short ; 
scutellum and abdomen very densely beset with bristles. Wings without a costal spine; apical cell 
opened near the wing’s tip; fourth vein not prolonged at its curvation; posterior cross-vein very near 
this curvation. 
The head is as broad as the thorax, the front narrowed behind; the face long, slightly 
inclined ; the vibrissee are inserted on the oral margin, which is somewhat prominent, 
and above them are some shorter bristles ; on the cheeks is a short pile; the facial ridges 
are bare. The arista is not distinctly jointed. ‘The palpi are not thickened towards 
the tip. The thorax bears the usual macrochete; those of the scutellum are very 
numerous and erect, except on the hind margin, where they are directed backward. 
The abdomen is broader than the thorax; and its entire surface, with ‘the exception of 
- the front borders of the segments, is beset with numerous and long macrochete. ‘The 
legs are slender. 
The hairy eyes, the relative length of the antennal joints, and the absence of facial 
bristles show that this new genus is allied to Hvrorista; from which it differs in the 
* Adouos, hairy. 
