British Species of Homalota. 101 



Mas; abdomine segmento sexto supra medio tuberculo 

 acuto ; segmento 7° margine posteriore medio deuticulis 

 2, utrinque denticulo obsoleto instructo. 



H. camhrica, Wollaston, Zoologist, 1855, App. p. ccv. 

 H. velox, Kr. Ins. Deutscli. ii. 201. 



Var. — Capite antice foveolato. 



A delicately formed species, somewhat like H. gre- 

 garia, but much smaller and more fragile. Antenna 

 slender, longer than the head and thorax, scarcely at all 

 thickened towards the apex, pitchy or pitchy testaceous, 

 joints 1, 2, 3 moderately long, of about equal length, the 

 3rd about half as long again as the fourth, 4-10 differing 

 but little in length, each longer than broad, eleventh 

 oblong, about half as long again as the tenth. Head sub- 

 quadrate, a little narrower than the thorax, finely punc- 

 tured. Thorax about as long as broad, scarcely narrowed 

 behind, a little narrower than the elytra, thickly and very 

 finely punctured. Elytra a little paler in colour than the 

 head and thorax, longer by a half than the latter, their 

 length greater than their width, very thickly and finely 

 punctured. Abdomen with segments 2-5 finely, but not 

 very densely punctured, the sixth nearly impunctate. 

 Legs slender, yellow. 



In some examples the head has a fovea in front, and 

 the thorax is more or less distinctly channelled. Also in 

 some specimens, each elytron has a distinct impression 

 near the apex ; the antennas also are a little more thick- 

 ened towards the apex in some specimens, than in others. 



The male has a large raised tubercle on the middle of 

 the upper surface of the sixth segment of the abdomen, 

 and the apex of the seventh segment is furnished with 

 four teeth, two small distinct ones placed together in the 

 middle, and a scarcely visible one on each side ; more- 

 over the hind margin of the seventh segment underneath 

 takes the form of an obtuse angle in the male, while it is 

 gently rounded in the female. 



Common amongst the shingle on the banks of the 

 Scotch rivers, also in Wales. 



Ohs. I. — In the British Museum are specimens of H. 

 velox sent by Dr. Kraatz; these agree with the species 

 I am at present considering. 



Obs. II. — Mr. Wollaston's description of H. camhrica, 

 (loc. cit.) evidently refers to an immature form of this 

 species ; one of the examples thei'e described is now in 



