British Hymenoptera. 213 



Hab. Common in many places. Deal, Walmer, 

 Dover, Reigate, Croydon, Hastings, Isle of Wight, Sid- 

 mouth, Norwich. 



Chelostoma, Latr. 

 Latr., Gen. Crust, et Ins., iv., p. 161. 



Elongate, subparallel- sided ; wings with two submarginal cells ; 

 labial palpi 4-jointed, the apical joint much shorter than 3rd ; 

 maxillary palpi 3-jointed. Abdomen with the 1st segment not 

 carinated at the base, where the perpendicular portion meets the 

 horizontal ; five ventral segments exposed in the ^ , the 2nd bear- 

 ing a well-defined tubercle or raised line; 5th segment with a 

 long curved apical fringe ; genital armature with the stipites long 

 and straight, much thickened at the apex (see PL X.) ; J with a 

 dense ventral pollen-brush composed of hairs with very fine fila- 

 mentary branches. 



(2) 1. ^ thorax densely hairy ; $ abdominal segments 



with white pubescent apical bands . , . . florisomne. 



(1) 2. (J thorax not densely hairy ; J abdominal seg- 

 ments not banded . . . . . . . . campanularum. 



1. Chelostoma florisomne, Linn. (PL X., figs. 4 — 4rt). 



Linn., Syst. Nat., ed. x., i., p. 577 ; Smith, Cat. Brit. 

 Hym., 2nd ed., p. 165. 



Elongate, black; <? clothed with rather long grey hairs. Abdo- 

 men incurved at the apex ; 2nd segment beneath with a large 

 tubercle, flattened and shining on its ventral surface ; J with the 

 head large and quadrate, the mandibles strong ; segments of the 

 abdomen posteriorly fringed with white hairs. 



3- . Head and thorax closely punctured, clothed rather densely 

 with long brownish gi-ey hairs ; mandibles grooved, simple at the 

 apex. Antennae with the 3rd to 7th joints produced beneath into 

 prominent angles. Wings sUghtly clouded. Abdomen elongate, 

 densely punctured, clothed with long gi-ey hairs, and with shorter 

 whitish ones on each side of the apex of the segments ; 7tli segment 

 terminating in two somewhat quadrate teeth, with a strong im- 

 pression between them ; beneath with the 2nd segment produced 

 into a large tubercle, flattened and somewliat excavated on its 

 lower surface, and pointed towards the base of the abdomen ; 3rd 

 segment excavated and very shining ; 4th densely clothed with pale 

 hairs ; 5th hairy at the base, its apex with a fringe of long bent 

 hairs, each hair knotted at intervals, except at the base ; 6th 

 shining, shghtly excavated, its apex rounded ; 7th shining, with 



