Lasiophthicus. 257 



Loew also ascribes intermedia three bands, and he states to have 

 known only the female; perhaps this is an error and he has only 

 had the male. 



18. Lasioplitliicus Rond. 



[Catabomba Ost. Sack.). 



This genus is, among all the allied genera, the one which is most 

 nearly allied to Syrphus. The species are of somewhat large size, 

 with distinct, whitish or yellow lunules on abdomen. The only disting- 

 uishing character lies in the shape of the head and the eyes. The 

 frons is in the male very broad and inflated, and it is thus produced 

 rather much above the level of the eyes; on account of its breadth 

 its upper angle is very obtuse, not rectangular or acute as generally 

 in Syrphus, and betvveen the upper margin and the side margin of the 

 frons there is a somewhat rounded angle, not present in Syrphus; 

 the side margins of frons and epistoma are straight, and as the frons 

 is so broad they are parallel (in seleniticus) or a little converging 

 dovi^nwards (in pyrastri). The eyes have in the male a part of the 

 facets considerably enlarged, and the dividing line is distinct; the space 

 with the enlarged facets begins at the suture and stretches as a broad 

 band down the median part of the eye to somewhat below the middle, 

 where it ends rounded; the other part of the eye has extremely small 

 facets. The eyes are (on account of the very small facets) very 

 densely hairy, the part with the larger facets naturally much less 

 densely, and the hairs on this part stop above before the eye-suture, 

 so that the upper part of the eyes is bare; the part along the hind 

 margin of the eye is also bare (as also in the hairy-eyed species of 

 Syrphus). In the female the frons is likewise arched and somewhat 

 inflated and produced above the level of the eyes, and there is no 

 indication of a transverse depression such as generally in Syrphus. 

 Ocellar triangle equilateral. Mouth parts as in Syrphus; maxillar 

 lacinia not long, palpi very short, about half as long as the lacinia, 

 not clubbed, with a few bristles at the apex. Scutellum with a long 

 fringe below the margin. Abdomen somewhat flat and marginate, 

 with the same number of segments as in Syrphus; genitalia small. 

 Wings with the cubital vein slightly and evenly incurved above the 

 first posterior cell; the wing-membrane is somewhat glistening, and 

 its microscopical hairiness is slight, as the hairs are very short and 

 sparse; only on the tinged apical part of the mediastinal cell the hairs 

 are developed in the usual way. Squamulæ and plumula as in Syr- 

 phus, the hairs on alar squamula rather broad. 



17 



