1890.] 17 



terior cells, incomplete, in consequence of the post-disoal veins not reaching the 

 apex ; two distinct basal cells ; the anal cell closed long before the margin, its 

 petiole stunted a little before reaching the margin. The first vein, at its end, shows 

 an elongate, fusiform, stigma-like black swelling (such a swelling does not exist in 

 P. murina*). 



The venation may likewise be compared to that of Megalybus pictus, Westwood, 

 Trans. Ent. Soc. Lond., 1876, tab. v, fig. 4a (a Chilian species), the differences will be 

 mentioned below, in the specific description. 



TegulcB large. Legs smooth, without spurs, comparatively slender (for a 

 Cyrtid) ; tarsi but little shorter than the tibiae ; joints 3 and 4 are the shortest ; 

 both together nearly equal to the 1st in length ; joints 2 and 5 shorter than the 1st 

 (nearly the same proportions exist in murina). Three pulvilli. Abdomen: first 

 segment short ; the five other dorsal segments are longer, and nearly of the same 

 length, with coarctations at the incisures ; in shape the abdomen is more oval than 

 that of murina. 



I compared Helle with PJiilopota murina from Asia Minor. The 

 eleven other described Philopotce are South American, and it remains 

 to be seen in what other characters they may differ from Helle. For 

 instance, they are described by Erichson as having pubescent eyes, 

 while the eyes of Helle and P. murina are glabrous. 



Helle longikostris. 

 Acrocera longirostris, Hudson, Manual, &c. (1892), p. 56, Tab. vii, 



fig. 4. 



Face brownish-yellow, its upper part nearly black ; proboscis pale yellow ; 

 frontal triangle brownish-yellow; antennae brownish, pseudarista paler ; hind part 

 of the head black, with a microscopic pale golden down (that looks silvery in an 

 oblique light). The upper part of the thorax, including the scutellum, of an opaque 

 greenish-bronze colour, densely mai-ked with microscopic transverse striae, and 

 covered with a hardly visible miscroscopic pale golden down ; the prevailing bronze 

 colour fades, and changes into yellowish-brown along the edges of the thoracic 

 sclerites, especially about the shoulders, behind the root of the wings, and on the 

 posterior margin of the scutellum. The abdomen is of the same metallic greenish- 

 bronze colour, microscopically, and densely punctured, clothed, like the thorax, with 

 a microscopic pale golden pubescence (which, in an oblique light, appears silvery). 

 The posterior edges of the dorsal and ventral segments yellowish-brown, which 

 colour also forms a somewhat broader margin along the lateral sutures. Tegulse 

 uniformly whitish, semi-transparent ; knob of the halteres yellowish-white. Coxse 

 and femora brown, paler about the trochanters ; tibiae pale brownish, still paler at 

 the base ; tarsi pale brownish, the joints pale yellow at the base. Wings hyaline, 

 slightly tinged with brownish; veins brown. The venation, as I said above, is 

 almost exactly like that of Megalybus picti'.s (Chili), as represented by Westwood 

 {I. c, fig. 4a). The differences are as follows : the auxiliary vein is not figured by 

 Westwood ; the first longitudinal of Helle (as described above) has a fusiform, black 



* I had occa.siou to examine numerous specimens of both sexes m the Berlin Museum. 



ii 



