20 STKATIOMYIDJE, 



2. Eyes pubescent Acaxthixa, Wied., 



Eyes entirely bare 3. [p. 26. 



3. Scutellum unspined, or produced conically 



upwards 4. 



Scutellum 2- or 4-spined, never conically 

 upturned , 8, 



4. Abdomen elongate, linear, much longer 



than thorax ; antennae conspicuously [Brum, p. 86. 



long, filiform Steatiosphixomyia, 



Abdomen very short, thick, rounded ; 

 antennal 3rd joint rounded or shortly 



elongate, never conspicuously so 5. [p. 21. 



5. Third vein unforked Zabrachia. Coq., 



Third vein forked 6. [p. 20. 



6. Scutellum not upturned Pachygastee, Mg., 



Scutellum distinctly conically upturned . . 7. [p. 24. 



7. Antennae filiform, longer than head Aceaspidea, Brauef, 



Antennal 3rd joint large, round. Monacanthohyia, 



[Brun., p. 23. 



8. Scutellum with two very short spines .... Waixacea, Dol., 

 Scutellum 4-spined 9. [p. 24. 



9. Third antennal joint with elongate style . . Tixda, Walk., p. 29. 

 Third antennal joint with pubescent arista. 10. 



10. Abdomen barely broader than thorax .... Eyaza, Walk., p. 31. 

 Abdomen much broader than thorax .... Ceaspedometopon, 



[Kert., p. 28. 



Genus PACHYGASTER, Mg. 



PacJiygaster, Meigen, 111. Mag. ii, p. 266 (1803). 



fappo, Latreille, Hist. Nat. Crust. Ins. xiv, p. 343 (1804). 



Neopachyg aster, Austen, Ent. Month. Mag. xxxvii, p. 245 (1901). 



Genotype, Nemotelus atra, Panz. ; by original designation. 



Read semicircular ; eyes large, contiguous in tf (except in rare 

 instances), practically bare, posterior orbits broad. Proboscis and 

 palpi small and inconspicuous. Antennae short, 3rd joint rounded, 

 with four indistinct annulations and long subapical pubescent 

 arista. Thorax large, broadened hindwards, transverse suture 

 deep, V-shaped, behind which the surface is somewhat inflated on 

 each side ; scutellum subtriangular, uuspined. Abdomen much 

 broader and barely longer than thorax, subglobular, 5-segmented ;. 

 genitalia small. Legs simple, nearly bare ; femora and metatarsi 

 long. Wings with 1st and 2nd veins short, the latter ending 

 barely beyond middle of costa ; 3rd vein normally forked, both 

 branches ending well before wing-tip ; discal cell large ; 4th vein 

 with only two terminations ; posterior cross-vein absent, as 5th 

 vein forms hinder side of discal cell ; anal cell closed far from 

 wing-border. 



Range. Europe, "North America, Orient. 



Life-history. That of several European species is known. The 

 larva lives in rotting tree-trunks and probably feeds either on 

 the decaying wood or thefrass produced by wood-boring Coleoptera. 



