DYTICID.E.— COLYMBETES. 79 



f Var. jS. Co. aeratus mihi. Steph. Catal. p. 51. No. 508. With the disc of the 

 thorax and the elytra rich greenish-brass ; in other respects similar to the 

 above. 



The Marsliamian specimen of var. a. is the only indigenous ex- 

 ample I have seen : I am not aware of its locality ; and of var. j8., 

 which is in the British Museum, I have also seen but one, which 

 was captured near Windsor. 



f Sp. 30. ferrugineus. Ovatus, convexus, rufo-testaceus aut ferrugineus nitidus, 

 Icevissimus, elytris saturatioribus basi margineque dilutioribus. (Long. corp. 

 4— 4i lin.) 



Co. ferrugineus mihi. Steph. Catal. Appendix. 



Ovate, convex, glossy, rusty-testaceous or ferruginous, very smooth : head rather 

 depressed, rufo-testaceous, with sometimes a small black spot on the crown : 

 thorax convex, rather sinuated behind, with the hinder angles thrown back 

 and obtuse, bright rufo-ferruginous, immaculate ; on the anterior and poste- 

 rior margins, towards the angles, are a few impressed dots, placed in a row : 

 elytra convex, deep rufo-ferruginous, immaculate, with the lateral margin 

 and the base indeterminately paler or testaceous, and the suture rufescent ; 

 the disc with three obsolete rows of distant impressed dots : thorax beneath 

 rufous : plurae and abdomen black : four anterior legs rufo-piceous, posterior 

 nearly black, the tarsi piceous : antennae pale rufo-ferruginous, very short. 



Of this insect, which is apparently nondescript, there are eight 

 specimens in the collection at the British Museum; they were 

 captured by Dr. Leach, in South Devon, in the spring of 1825. 



Sp. 31. aterrimus. Subovatus subameo-niger, obscare-nitidus, immaculatus, an- 



tennis solis rufis. (Long. corp. 4 lin.) 

 Co. niger. Steph. Catal. p. 51. No. 509. 



Subovate, somewhat brassy-black, obscurely shining, immaculate; beneath a 

 powerful glass, somewhat finely striated, as in Co. bipustulatus : head with 

 the mouth and labrum pitchy; the vertex immaculate: thorax obsoletely 

 sinuated behind, slightly convex ; elytra somewhat ovate and convex, very 

 finely but obsoletely striate, with three faint longitudinal rows of impressions 

 at the base, and some scattered dots towards the apex ; dull brassy-black, with 

 the outer margin obscurely piceous : body pitchy-black, tinged with aeneous 

 beneath, and thickly strigose: legs, especially the posterior, deep pitchy- 

 black. 



Co. niger of De Jean is synonymous with Co. grapii : I have therefore been 

 compelled to change the name from that in my Catalogue. 



I have only a single specimen, which was taken near London, 

 in L820. 



