368 Mr. J. Nietner on new Ceylon Coleoptera. 



folds of growth. Tlie very tumid figure and incurved umbones 

 are the external characters whereby it may be distinguished 

 from Tancredia ; the test is likewise thicker than in the latter 

 genus. At present it does not seem that the Cornbrash shell 

 can be separated as a species either from that of the Yorkshire 

 Coralline Oolite, from the Normandic specimens, or from those 

 figured by Buvignier from the Department of the Meuse ; but 

 it is desirable that additional British examples of this rare form 

 should be examined. I need hardly suggest to you the expe- 

 diency of making a rigorous search in the Cornbrash and the 

 Kelloway rock of the vicinity of Cirencester ; and believe me to 

 remain, dear Sir, 



Yours, &C.J 



John Lycett. 

 Minchinhampton, October 19, 1857. 



XXXVIII. — Descriptions of new Ceylon Coleoptera. 

 By John Nietner, Colombo, Ceylon. 



[Continued from p. 282.] 



Tribe Cratocerid.e. 



Oosoma, n. g., N. 



Corpus ovatum, subconvexum, glabrum. Caput transversim sub- 

 orbiculare, robvistum ; oculis magnis, ovatis, ])arum prominulis. 

 Mentum profuude emarginatum, lobis extus rotundatis, a])ice sub- 

 obtusis, dente minimo, obtuso. Ligula submembranacea miuima, 

 angustata, paraglossis maximis, conuatis, ligulam totam amplec- 

 tentibus, apice leviter sed abrupte et sat profunde emargiuatis. 

 Palpi art. ult. ovate, apice abruptius angustato leviterque truncate. 

 Clvpeus subsemilunariter emarginatus. Labrum transversum, ])ro- 

 fundius angulate emarginatum, augulis anter. rotundatis, latcribus 

 angulato-rotundatum. Mandibuke parvce, validse, cdentatee, inter 

 med. et apic. arcuatse. Autennse robustee, thoracis med. parum 

 superantibus, art. 1 et 11 subsequalibus, 2-10 parum brevioribus, 

 subsequalibus, 1-3 basi angustatis, rebquis ovatis, 5-1 1 leviter de- 

 pressis. Thorax transversus, capite parum latior, basi quadratus, 

 apicem versus leviter angustatus, antice vix emarginatus, postice 

 leviter bisinuatus, elytris fortiter appbcatus. Elytra basi quadrata, 

 thoracis latitudiue, apice oblique subtruucata, striata. Pedes validi 

 fortiterque armati, subaequales ; tibiis costatis, ant. sat profunde 

 emarginatis, apicem versus dilatatis, 4 post, apice 4-calcaratis ; tarsis 

 art. 1-4 gradatim minoribus, ant. leviter dilatatis, art. 1° cylindrico- 

 trigono, 2-4 trigonis, pest. art. 1-4 subtus longitudinaliter biserratis. 



Interesting insects, apparently nearly allied to Nothopus, of 

 an appearance which easily distinguishes them from any other 



