DYTICID.E. COLYMBETES. 71 



my Systematic Catalogue I have unintentionally permitted them to occupy a 

 secondary position*. 



This is likewise not very abundant, but occurs sometimes near 

 the metropolis, as well as in Norfolk. " Carlisle." — Dr. Leach. 

 " Pools, Netley."— Rev. F. W. Hope. « Whittlesea Mere, plen- 

 tifully." — Messrs. Chant and Bentley. 



Sp. 12. agilis. Oblongo-ovatus, supra Jlavicans, subtus niger, thorace antice pos- 

 ticeque nigro, elytris crebre nigro-irroratis, striisque disci punctatis. (Long, 

 corp. 5— 5^ lin.) 



Dy. agilis. Fabricius. — Co. agilis. Steph. Catal. p. 49. No. 492. 



Rather larger than the last ; oblong-ovate, above yellowish : thorax with the disc 

 immaculate, the anterior and posterior margins in the middle with a narrow 

 black edge: scutellum black: elytra oblong-ovate, moderately convex; the 

 disc very thickly irrorated with black, the outer margin and a narrow streak 

 down the suture immaculate, the disc of each with two longitudinal strise of 

 impressed dots ; and the entire surface under a strong lens very finely strigose, 

 especially in the female : body beneath black, finely strigose ; sternum with 

 the apex ferruginous ; the four hinder segments of the abdomen margined 

 with ferruginous : the four anterior legs pale, the posterior deep ferruginous, 

 the femora beneath with an oblong dusky spot. 



Decidedly rare in Britain. " In a stream in Norfolk." — A. H. 

 Haworth, Esq. " Exeter." — Dr. Leach. " Kensington-gardens." 

 — Rev. F. W. Hope. " In a stream near Cambridge, once taken." 

 — Professor Henslow. " Whittlesea Mere." — Mr. Bentley. 



Sp. 13. adspersus. Plate XII. f. 3. Brevior, ovalis, supra Jlavescens, subtus 



niger, elytris nigro-irroratis, striis disci punctatis. (Long. corp. 5 lin.) 

 Dy. adspersus. Fabricius.— Co. adspersus. Steph. Catal. p. 49. No. 493. 



Broader but not longer than Co. collaris; oval, above flavescent: head with the 

 crown black, with two transverse testaceous spots : thorax entirely flavescent, 

 with two very obsolete remote fuscous spots on the hinder margin, the surface 

 very finely punctulate : scutellum pitchy-brown : elytra broad, oval, dilated 

 towards the middle, rather convex, rather thickly irrorated with black, the 

 outer margin and a narrow line down the suture immaculate ; on the disc are 

 three punctate striae : the breast smooth glossy black, sternum testaceous ; ab- 

 domen shining black, with the base, apex, and margins of the segments tes- 

 taceous : legs entirely yellowish. 



* In accordance with the above, Stenolophus vespertinus, vol. i. p. 166, should 

 be called St. lateralis, after Marsham, not St. placidus, Gyllenhal.— Marsham's 

 name did not recur to me at the time the observation in p. 183 was penned. 



