60 Psyche [April 



bears most resemblance to Trypetoptera Hendei, but presents these 

 differences: first vein ending far before the anterior cross vein; 

 meso- and pteropleurse with very fine hairs which are scarcely 

 bristle-like; second antennal joint obconical and not rounded; 

 calypteres pale; fronto-orbital sutures distinct, in Trypetoptera 

 the periorbits are not differentiated; three dprsocentral bristles. 



None of the other genera, except Coremacef'a Rondani, have the 

 periorbits so definitely separated from the interfrontalia. The 

 presence of three dorsocentrals and of a convex and broad middle 

 portion of the front are unusual characters in the Sciomyzidse. 



Table of Genera. 



1. Tibiae with evident preapical bristle; two fronto-orbital bristles; postvertical 



bristles convergent; ovipositor not specialized, with two small lamellae 



(Subfamily Lauxaniinse) 2 



Tibia? without preapical bristle; front with only the upper orbital bristle; 

 postvertical bristles divergent; ovipositor flattened, with chitinous tube-like 

 ending (Subfamily Lonchseinoe) 13 



2. Face swollen, in profile convex 3 



Face flat, without convexity in the middle, in profile a straight line 7 



3. Third anntenal joint greatly lengthened, pointed or slender and linear 4 



Third antennal joint shortened and oval, first joint shorter than second 6 



1. Two sternopleural bristles; both fronto-orbital bristles reclinate; face not 



strongly gibbous. (Fig. 10.) Lauxania Latreille. 



One sternopleural; anterior pair of fronto-orbitals convergent; face markedly 

 gibbous 5 



5. Head higher than long, occiput and front concave; the line connecting the 



fronto-orbitals converging in front, lower orbital bristle strongly inclined; 

 facial groove nearly touching lower angle of eye, extending back under the 

 eye so that the face is strongly developed underneath as well as in front; 



ocelli not elevated. (Fig. 6.) Physogenia Macquart. 



Head more globular, the front convex; fronto-orbital bristles in parallel rows; 

 facial groove parallel with margin of eye, continuing obliquely downward 

 leaving the cheeks free, the face in front of and not beneath this line; ocellar 

 triangle somewhat raised. (Fig. 7.) Pachycerina Macquart. 



6. Face with a transverse groove above the mouth, or with lateral vestiges of a 



groove, the oral margin projecting more or less in front of this groove; arista 



sometimes pubescent. (Fig. 12.) Caliope Haliday. 



Face swollen, with or without a transverse groove above the mouth, but the 

 oral margin retracted beneath or behind this groove; arista plumose. (Fig. 

 11.) Xangelina Walker. 



7. In profile the angle formed by the front and face acute, less than 90 degrees; 



front less inclined than the face, so that the mouth opening is strongly re- 

 tracted 8 



