ORTALID^ — STENERETMA. 187 



Idiotypa, especially evident in the structure of the abdomen. 

 Among the differences of these two genera I will only mention 

 that the structure of the head of Idiotypa is not unlike that of 

 Dacus, while the head of Steneretma resembles that of Tritoxa. 

 As Steneretma and Tritoxa also agree in the presence of a 

 mesothoracic bristle and in the absence of a prothoracic one, the 

 former genus, if its first longitudinal vein showed a distinct 

 pubescence, would have to be placed next to Tritoxa. 



1. S. laticailda n. sp. 9 . — Lutea, segmentis abdoininalibus singulis 

 postice anguste et aequaliter fusco-marginatis, tarsis prseter basiiu nigio- 

 fuscis, alis luteo cinereis, albido-bifasciatis. 



Dark-yellow, the single abdominal segments on their posterior margin 

 with a narrow infuscated border ; the tarsi, with the exception of the 

 basis, blackish-brown ; wings yellowish-gray with two whitish cross- 

 bands. Long. corp. 0.14; cum terebrS, 0.19 ; long. al. 0.11 — 0.12. 



Of a dark-yellow color, shining. The broad, rather convex 

 front bears, besides the long bristles on the vertex and in the 

 region of the ocelli, a moderate quantity of rather long black 

 hairs ; the comparatively strong convexity of the occiput almost 

 obliterates the usual edge between it and the vertex. The 

 antenna? are of the same color as the rest of the body, and of 

 more than half the length of the face ; their third joint elongate, 

 rounded at the tip ; the thin and bare arista is very long. 

 Clypeus, palpi, and proboscis likewise partake of the general 

 coloring of the body. Thorax but little elevated and rather 

 narrow in comparison to its length ; its dorsum on the sides and 

 on its posterior border with a few rather long black bristles; upon 

 the remainder of its surface only with a short, black pubescence. 

 Scutellum small, bare, with the exception of the two bristles upon 

 its end. Pleurae glabrous; besides the mesothoracic bristle they 

 bear only a single bristle not far below the root of the wing. The 

 abdomen is narrow and elongate, attenuate towards the basis, not 

 so much, however, as in the females of Idiotypa appendiculata ; 

 its segments have, on the posterior margin, a narrow border of 

 equal breadth and of a brown or reddish-brown color ; upon the 

 last segment this margin becomes indistinct, or it is altogether 

 wanting. The blackish pubescence of the abdomen is every- 

 where very short and not conspicuous. The ovipositor is of the 

 same color as the remainder of the body and is strikingly 



