198 [February. 



indebted to both Von Hagens and Gr. C. Thomson for the careful structu- 

 ral study they have made of this genus, and I have borrowed largely 

 from their remarks in the characters I have used. 



SPHECODES. 

 (4) 1. Posterior wings with 7 — 10 alar hooks ; antennae in $ long, 3rd joint not 

 one-fourth so long as the 4th. 



(3) 2. Vertex of the head in both sexes with its sides converging rapidly behind 

 the eyes. $ genitalia with the squama produced into a membranous 

 wing on its inner margin, and terminating in two unequal processes 

 densely clothed with long hairs, of which the upper process is much 

 longer than the under, and is produced and widened at the apex, the 

 widened apices crossing each other. $ with the apical dorsal valve 

 narrow and linear gibbus. 



(2) 3. Vertex in both sexes usually more or less quadrate (though very variable 

 in this respect). $ genitalia with the squama unwinged, and terminating 

 in two sub-equal processes, sparingly clothed with short hairs. $ with 

 the apical dorsal valve wide and flat stjbquadrattjs. 



(1) 4. Posterior wings with 5 — 6 alar hooks ; antennae in $ short, 3rd joint much 

 more than one-fourth the length of the 4th. 



(10) 5. Genitalia of the $ with the stipites not grooved ; antennae with the joints 

 much produced and rounded in front. $ with the puncturation of the 

 thorax large and close, 3rd segment of the abdomen without a lateral 

 black spot or fovea. 



(9) 6. Surface of genitalia in $ longitudinally striate, 2nd sub-marginal cell 

 longer than wide in both sexes. 



(8) 7. Larger ; $ genitalia with the sagittae very narrow, and fringed with short 

 hairs, the squama membranous and somewhat quadrate, with a thickened 

 semi-lunate central region. ? with the apical dorsal valve wide, slightly 



reflexed and shining at the edges pilifrons, Thorns. 



= rufiventris, Sm., nee Wesm. 



(7) 8. Smaller ; g genitalia with the sagittae much widened at the base, the squama 

 produced into two processes, of which the under one is rather the longer. 

 9 with the apical dorsal valve narrower, dull, and with an impression 



running parallel to its edge round its apex 1. similis, Wesm., n. sp. 



Bull. Acad. Brux., 1835, T. ii, p. 279. 



(6) 9. Surface of genitalia in <J finely rugose, not longitudinally striate, 2nd sub- 

 marginal cell, in both sexes, on its lower margin, as wide as long, narrowed 



above 2. puncticeps, Thorns., n. sp. 



Op. Ent., 100, 8. 



(5) 10. Punctures of thorax fine and distant, genitalia of the <? with the stipites 

 widely grooved. $ with the 3rd segment of the abdomen generally with 

 a small black spot or fovea on each side near the base, apical dorsal 

 valve narrow ephippium. 



