F. R. COLE 27 



Abdomen thickly clothed with a yellowish gray, silky pile, which has a pur- 

 plish brown sheen in certain lights. Hind margins of segments two, three 

 and four yellow, the yellow not meeting in the center; on the third segment 

 the yellow is quite widely separated. The yellow does not attain the lateral 

 margins (see fig. 14). Venter black with purphsh metallic reflections and 

 irregular yellow spots near the lateral margins of the segments. Genitalia 

 yellowish. 



Legs yellowish, the two front pair with brown below. Hind legs dark brown 

 above. Claws and tips of last tarsal joints black. Wings hyaline, the veins 

 brown and distinct. The longitudinal veins reach the wing margin. The 

 cross-vein in the first posterior cell is beyond the cross-vein at the base of the 

 second posterior, thus differing from helluo O. S., from which it also differs in 

 having the first cell widely open. The fork at the end of the third vein is very 

 wide. Length, 12.5 mm. 



One specimen, a male, collected at Austin, Texas, November 

 11, 1899. 



Type. — In the collection of Prof. A. L. Melander. 



There are six other species of this genus: calida Wiedemann, 

 longicornis Erichson, lugubris Gerstaecker, and tumens Walker 

 from Brazil; one species, trichocera O. S., from Panama; one spe- 

 cies, grossa 0. S., described from Costa Rica. The last named 

 species is figured on Plate IV, figure 15; being redrawn from Van 

 der Wulp's figure in the Biologia. 



LASIA 



Lasia Wiedemann, Anal. Ent., p. ii. Ausser. Zweifi. Ins., i, p. 329, (1824). 



Flies of good size, some of the species l)eing very large. The 

 proboscis is very long, projecting beyond the tip of the abdomen 

 when at rest. The base of the prol)oscis is covered with a prom- 

 inent shield; the labellae are slender and scarcely to be distin- 

 guished from the rest of the proboscis. Apparently there is no 

 face, the proboscis coming out about the middle of the head, in 

 profile just below the antennae. Head composed almost entirely 

 of the eyes, the occiput even moie restricted than is usual in the 

 family. Frontal triangle veiy small. First joint of the antennae 

 almost buried in the head, second joint short and cylindrical, third 

 long and cylindrical, or more or less compressed, usually pointed. 

 The ej^es are pilose and are contiguous above the antennae (see 

 Plate II, fig. 11a). The ocellar tul^ercle is said to be very promi- 

 nent in a few species, as in L. ocelliger, which is described as hav- 

 ing one ocellus. The usual nuniljcr of ocelli is two. 



TRANS. AM. ENT. SOC, XLV. 



