HYMENOPTERA. 359 



wards the vertex ; antenuse short, subfiUform, sHghtly thickened 

 in the middle, pointed at the apex ; the scape short, thick and 

 cyhndrical ; the first joint of the flagellum short, about half the 

 length of the second, the rest of about equal length ; mandibles 

 arcuate, acute at their apex, not toothed within, with a dentate 

 process beneath towards the base ; the labrum concealed. Tho- 

 rax rotundate, the collar narrow, transverse; the scutellum 

 transverse, oblong- quadrate ; the metathorax truncated, with a 

 mucro at the sides and about the middle of the truncation ; the 

 superior wings with one marginal and three submarginal cells ; 

 the marginal cell elongate, rounded at the apex, and slightly 

 appendiculated ; the first submarginal cell elongate, twice the 

 length of the second and third united; the second submarginal 

 cell petiolated; the third oblique, of nearly equal width; the 

 first recurrent nervure received by the first submarginal cell near 

 its apex ; the second recurrent nervure entering the second sub- 

 marginal cell near its apex ; the legs stout ; the anterior tarsi 

 cilated outside, the intermediate and posterior tibiae spinose ; 

 the claws simple, having a pulvillus in their fork. Abdomen 

 ovato-conic, truncated at the base, the apex acute. 



1. Helioryctes melanopyrus. pi. IX. fis. 3. 



Female. Length 4 lines. — Head and thorax black, opake, 

 finely and very closely punctured ; the palpi pale rufo-testaceous, 

 the mandibles ferruginous in the middle. Thorax : the meta- 

 thorax above enclosed by a half-circular ridge, the enclosed space 

 reticulated ; wings dark fuscous, nearly black ; the legs ferrugi- 

 nous, with the coxaj, trochanters, and base of the anterior femora 

 behind, black ; the posterior tibiaj incrassated towards their apex, 

 roughened outside, and furnished with three rows of short acute 

 spines; the intermediate tibiae not roughened, but similarly 

 armed to the posterior pair. Abdomen ferruginous, veiy closelv 

 and finely punctured, the two ajjical segments very smooth and 

 shining, with a few scattered fine punctures; the sides of the 

 a))ical segment carinated. 



Hab. The Gambia. (Coll. F. Smith.) 



Genus 8. GORYTES. 



Sphex, pt., Linn. Syst. Nat. i. 941 (1766) 

 Vespa, pt., Linn. Syst. Nat. i. 948 (1/66). 

 Crabro, pt., Rossi, Faun. Efrus. App. 123 (1790). 

 Melhnus, pt., Fabr. Ent. Si/st. ii. 285 (1793). 

 Gorytes, Latr. Hist. Nat. .xiii. 308 (1805). 

 Arpactus, Jurine, Uym. 194 (1S07). 



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