78 Bulletin of the Brooklyn Entomological Society Vol. XI 



original but modified to conform with my others. A specimen 

 very kindly loaned by Dr. Schwarz has enabled me to study it 

 in detail. 



As stated in the original account, this species was collected 

 by the late H. G. Hubbard, at Tucson, Arizona, and taken from 

 the dead tissues of a wounded giant cactus, Cereus giganteus. 

 A specimen from Lower California, in the collection of Mr. H. C. 

 Fall, has been referred by him to this species. ' - 



Cossonus fossicollis n. sp. Black, shining. Head practically impunctate 

 posteriorly, very finely and sparsely punctate on dorsal surface of rostrum, 

 more coarsely and closely, at sides. Head, including eyes, cuneiform, and 

 gradually convergent to rostrum, the eyes rather flat and just projecting 

 beyond sides of head, an elliptical shaped fovea on vertex between eyes, 

 the diameter of head across eyes a little less than one third greater than 

 dilated portion of rostrum. Rostrum distinctly less than one half length 

 of thorax, arcuate, basal portion about equal to apical, moderately broad 

 and with parallel sides, apical portion just perceptibly wider than basal 

 portion. Joints of funicle of antennae transverse and but very gradually 

 increasing in width outwards, the outermost joint distinctly less than one 

 half width of club. 



Prothorax distinctly longer than wide, base bisinuate, sides at middle 

 two thirds almost parallel, gradually obliquely convergent posteriorly, 

 gradually rounded anteriorly to constricted anterior portion, surface flat- 

 tened above, with deep longitudinal triangular depression extending from 

 its apex near the anterior margin to the base where it occupies over one 

 third of total breadth ; through the middle of this depression there runs 

 a linear slightly elevated line that is bounded anteriorly by a single row 

 of deep punctures and posteriorly by a confused series of similar punc- 

 tures, the disc outside of the depression but very minutely and sparsely 

 punctured and quite shining, the sides of thorax moderately coarsely and 

 closely punctured. 



Elytra distinctly wider than thorax, slightly convex above, deeply striate, 

 coarsely punctured but with punctures well separated even anteriorly, 

 where they are coarser and deeper, intervals slightly convex and with 

 punctures practically imperceptible. 



Body beneath coarsely and closely punctured on prothorax and sides of 

 mesothorax and anterior segments of abdomen, and rather finely and 

 sparsely on mesosternum and median and posterior part of abdomen. 



Length 3.5 mm., breadth i mm. 



Type: A unique from the Santa Rita Mountains of Arizona, collected 

 May 25, from the Hubbard and Schwarz collection, and now in the U. S. 

 Nat. Mus. by whom it was submitted for study and description. 



