19060 173 



Rpeciea cnvifrons^ Thorns. Of this determination, at any rate, there 

 appears to be no doubt. Thomson in his Hymenoptera Seandinaviae 

 makes two species of our ceplialotes, cavifrons, Th., and plnnifrons, Th. 

 Of these cavifrons is our common species, but I have little doubt that 

 planifrons occurs also in Britain ; in fact, I possess a single ^ ex 

 Shuckard's collection without date or locality. T have no doubt it is 

 a British specimen, but until more evidence is to hand T do not pro- 

 pose to introduce it into our list. Still it may be well here to point 

 out the distinctive features of the two species so as to enable any 

 one who may come across planifrons to recognise it. 



It i8 rather smaller than cavifrons. In the $ the excavation between the two 

 teeth of the 3rcl antenna! joint is not nearly so deep, so that the joint has an 

 altogether thicker and clumsier appearance, and the clypeus is clothed with silvery, 

 not golden, hairs. This character, however, is probably variable. 



The 9 may be recognised easily by the shape of the clypeus, vehich is produced 

 and narrowly truncate in the centre, the distance between the teeth or angles of the 

 truncature being much less than that which lies between each of them and the black 

 prominent tooth which limits the lateral emargination — in this respect it more 

 resembles the following species, but the central teeth are nearer each other and 

 further from the lateral ones than in saundersi. 



Crahro saundersi, Perk. (Ent. Mo. Mag., xxxv, p. 261). 

 This very distinct species is, as Mr. Perkins points out, almost 

 certainly that which is described as sexcinctus by Wesmael, and it is 

 also I think undoubtedly the species which is known by tbe name of 

 sexcinctus, Fab., among continental Entomologists ; at the same time 

 no one has pointed out the peculiar character of the (^ , viz., the fine 

 tuft of curled hairs on the first tooth of the antennae, and without 

 reference to Fabricius' type it is impossible to be sure what his species 

 is : therefore Mr. Perkins has renamed it. 



It may be known from cavifrons, Thoms., by its usually rather larger size, and 

 darker coloration, the black being more extensive. In the $ the first three teeth 

 of the antennae are equidistant, whereas in cavifrons the distance between the Ist 

 and 2nd is greater than that between the 2ikI and 3rd. There is also the distinctive 

 character of the curled hairs at the apex of the first tooth. 



The ? may be known by the form of the clypeus — in saundersi ihe outer teeth 

 of the quadridentate margin are much more distant from the inner ones than the 

 inner ones are from each other, and the face is much wider across the eyes in pro- 

 portion to its height. The clypeus in both sexes is silvery, whereas as a rule in 

 cavifrons it is golden. As, however, cavifrons occasionally vai'ies in this respect, no 

 reliance can be put on this as a character. 



Coast of Devonshire and North Wilts. (R. C. L. Perkins) ; 

 Lyme Regis (Nevinsou). 



