British Species of Corticaria. 139 



with one of the stronger lateral teeth ; the posterior margin pro- 

 duced and rounded in the middle ; the upper surface convex, 

 thickly and sub-rugosely punctured, and with a large fovea behind. 

 Elytra oblong ovate ; at the shoulders (which are rounded) but 

 little broader than the thorax at the broadest part ; above convex, 

 and with rows of punctures packed closely side by side, but 

 among these the rows belonging to the ordinary eight striae are 

 distinguishable, the punctures being a little larger and more closely 

 packed in the longitudinal direction than those of the interstices ; 

 on the basal part of the elytra the interstices are transversely 

 rugulose. The rather short antennae, as well as the legs, are rufo- 

 testaceous. 



Like most other species, this varies in colouring, being not un- 

 frequentiy uniform dull rufous, but in full-coloured specimens the 

 elytra are more or less pitchy, darker than the head and thorax. 

 The small size, combined with the sculpturing of the elytra, and 

 the strongly serrated sides of the thorax, will serve to distinguish 

 this species. C.crenulata, which approaches it most nearly in the' 

 sculpturing of the elytra (see observations attached to that species) 

 besides being about double the bulk, differs in having the thorax 

 more ample, more regularly rounded, less strongly crenulate at the 

 sides, the head proportionately smaller, the antennae longer, and, 

 in the male sex, has the thighs much incrassated, which is not the 

 case in the present species. 



I have found one specimen of this species in the nest of For- 

 mica rufa at Weybridge, but several other specimens, which I have 

 taken at different times, were certainly not in ant's nests. 



6. Corticaria cytindrica. C. sub-cylindrica, testacea, brevius 

 pubescens ; thorace sub-rotundato, antice truncato, late- 

 ribus crenato, supra punctato, postice foveolato ; elytris 

 elongatis, fortius punctato-striatis, interstitiis punctis sparsis 

 adspersis, basi transversim rugulosis, marginibus plerumque 

 infuscatis. 



Long, f — 1 lin. 



Corticaria cylindrica, Mannerh. Germ. Zeitschr. v. 55, 23. 



borealis, Wollaston, Append, to Zoologist, ccvi. 



(1S55). 



Among the British species this is certainly most near to the C. 

 serrata, but it is readily distinguished by its larger size, clear tes- 

 taceous colour, and by the almost impunctate interstices to the 

 striae of the elytra. The head is rather large, and the eyes, which 



