232 Mr. E. Saunders' Synopsis of British 



? almost identical with P. ■pcvtiiiipcs, and, but for 

 the want of the 3rd submarginal cell, I believe un- 

 distinguishable from it. 

 Length 7 — 9 mill. 



Hah. — Chobham, Bournemouth, Weybridge, etc. ; rare. 

 Often with P. pectiuiju's, and I feel it hard to believe that 

 the two are more than forms of the same species. 



PoMPiLus, Fahy. (PI. YII. fig. 16.) 



Ent. Syst. Suppl. p. 246. 



This genus, so closely allied to several of those that 

 follow it, may be at once known by the impunctate surface 

 of the vertex of the head. Although this character, 

 which has been pointed out by Thomson, may seem to 

 some to be scarcely of generic importance, still it affords 

 a simple means of determining the genus, and dis- 

 tinguishes the <? from those of the allied genera, 

 wherein the ? are otherwise very different ; wings with 

 three submarginal cells ; posterior tibise of the ? not 

 serrate. 



(K) 1. Abdomen entirely black, or black with white 

 spots. 

 Abdomen with white spots . . . . . . rufipex. 



Abdomen without white spots. 

 Small, legs red in the J ; posterior tibia; in the^ 

 with a pale sj^ot at the base. Head with a small 

 ])ale spot on the interior margins of the eyes . . cinctdlux. 

 Head and legs entirely black. 

 , ^ not covered with grey sericeous pubescence ; J 

 with the apical segment of the abdomen densely 

 covered with black bristly hairs . . . . niger. 



(G) 7. (J covered with grey sericeous pubescence ; 5 

 with only a few scattered hairs on the apical 

 segment . . . . . . . . . . . . 'phimheus. 



(1) 8. Abdomen red at the base. 

 (12) 0. Metathorax more or less pilose. 

 (11) 10. Larger, the three red basal segments of the abdo- 

 men each with a black apical band . . . . riaticus. 



(10)11. Smaller, the basal segments entirely red. . .. consobrlims. 



(!)) 1';;. Metathorax not jjilose. 

 (2!2) l'-'>. Prothorax sharply angulated iiosteriorly. 

 (17) 11:. 5 with the anteiior tar^i simply spincd. the 

 spines short; ^ either with the posterior tibial 

 sinuate on the side towards the body and incras- 

 sated at the apex, or with the 3rd submarginal 

 cell subquadrate, larger than the 2ud. 



