Insects. 2207 



rufous in front; the basal joint of the posterior tarsi white. The ab- 

 domen has a short, fine, silvery pile, observable in certain lights, with 

 a patch of white pubescence on the margin of the basal segment late- 

 rally, frequently obliterated. 



Var. the face of the female sometimes entirely black. 

 So very distinct is this species from any of the foregoing, that, aided 

 by Mr. Kirby's excellent descriptions, it appears remarkable that St. 

 Fargeau should have considered annulatus, annularis and dilatata as 

 probable varieties of signata : such I am confident is not the case, as 

 a careful examination of their sculpture alone will easily determine : 

 the metathorax of each species is different, although the difference 

 would be difficult to express in words, and the characters pointed out 

 are ample for specific distinction. This is the largest species of the 

 genus hitherto discovered in this country : the males are frequently 

 larger than the females. 



Genus. — Cilissa, Leach. 

 Andrena, Latr. Apis, Panzer. Melitta, Kirby. Kirbya, St. Fargeau. 



Generic characters. — The labial palpi four-jointed, the maxillary 

 palpi six-jointed. The superior wings having three submarginal cells. 

 The antennae of the males sub-serrate beneath. The ocelli placed in 

 a curve on the vertex. 



Of this genus we have two British species : they are very closely 

 allied to the true bees, or those having the tongue elongate : in this 

 genus it is sub-elongate and acute, thus forming as it were a connect- 

 ing link, as Mr. Kirby observes, between the Andrenoides and Panur- 

 gides. 



Sp. 1. Cilissa h^emorrhoidalis. 



Apis hcemorrhoidalis, Panzer. Melitta chrysura, Kirby. Kirbya 



chrysura, St. Fargeau. 



Female. — (Length 5j — 6 lines). Black ; the face below the anten- 

 nae and cheeks clothed with pale fulvous pubescence, on the vertex 

 it is black and not so dense ; the clypeus coarsely punctured ; the 

 mandibles arcuate, rufo-piceous at their apex ; the apical joints of 

 the antennae piceous beneath. Thorax clothed with pale fulvous pu- 

 bescence ; on the disk it is black ; the tegulae nigio-piceous ; wings 



