STRATIOMYIDJE. 19 



3. Fourth vein with only two terminations (i.e., 



only two true veinlets issuing from discal cell, 



the apparent 3rd veinlet being the upper [p. 19. 



branch of the 5th vein) PACHYGASTRINJE, 



Fourth vein with three terminations (i. e., three 

 true veinlets issuing from discal cell); upper 

 branch of 5th vein either separated from discal 

 cell by the posterior cross- vein being present, 

 or in punctiform contact with that cell when 

 posterior cross-vein is absent 4. 



4. Anterior cross-vein joining prrefurca to discal cell. SARGIN^E, p. 72. 

 Anterior cross-vein joining 3rd vein, as usual, to 



discal cell ' 6. [p. 56. 



5. Posterior cross-vein present STRATIOMYIN.S:, 



Posterior cross-vein absent CLITELLARIINJE, 



[p. 38. 



The line of demarcation between the two last subfamilies is 

 very indefinite, and, as more than one author has suggested, they 

 might well be united into a single subfamily. The posterior cross- 

 vein is often a variable quantity even in groups in which it is 

 technically present for instance, it is absent in Ptecticus australis, 

 Sch., though present in the other Indian species. Williston sinks 

 the alleged subfamily HERMETIIX^E in CLITELLARIIK/E and his view 

 is adopted here. 



Subfamily PACHYGASTHIN^. 



Head comparatively small ; eyes generally bare ; antennae of 

 very varied form, branched (Ptilocera), elongate (Tinda, etc.) 

 filiform (Stratiosphecomyia) , globular (Pachyyaster), or of irregular 

 shape. 



Thorax subquadrate, oval ; scutellum unarmed or with two or 

 four marginal spines ; sometimes produced upwards or hind wards 

 into a strong blunt cone. Abdomen 5- or 6-segmented, of very 

 varied shape ; often exceedingly broad, much broader than thorax, 

 globular ; sometimes oval or oblong, or much elongated and more 

 or less cylindrical. Legs comparatively short, slender, smooth. 

 Wings with 3rd vein simple or forked ; posterior cross-vein absent 

 through 5th vein forming hinder side of discal cell ; 4th vein with 

 only two veinlets. Four posterior cells, united on wing-margin. 



The essential character of this subfamily is the presence of 

 only three veins apparently issuing from the discal cell, the lower 

 one being the upper branch of the 5th vein. Mostly bare 

 species. 



Table of Genera* 



[p. 33. 

 1 . Antennae branched PTILOCERA, "Wied., 



Antennae of various forms, never branched. 2. 



For table of Oriental genera, vide Brunetti, Rec. Ind. Mu?. i, p. 89. 



c2 



