770 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



eter; surface of bead minutely and obscurely granulate. Thorax 

 nearly equal, slightly broadening posteriorly, the anterior angles well 

 rounded, the front border very deeply and roundly excised, the hind 

 border nearly straight 5 the whole fully twice as broad as the head, and 

 twice as broad as long. Scutellutn obscure, but apparently of about 

 equal length and breadth, and regularly triangular. Abdomen well 

 rounded, half as long again as broad. Tegmina obscure or lost in all 

 the specimens seen. Thorax and scutellum minutely granulate, like the 

 head. Posterior half, at least, of the abdomen profusely covered with 

 shallow punctures. 



Length of body S-TS"""", of head 0.6™'", of middle of thorax 0.75™'" ; 

 breadth of head 0.8™™, of thorax 1.8™™, of abdomen 2.25™™. 



Cydnus ? mamillanus. — An obscure specimen (No. 39) is of doubtful 

 generic relations, but evidently belongs to the Cydnidw. The body is 

 broad and convex in front, with a rapidly tapering abdomen, scarcely 

 at all rounded, even at the tip. The head, as seen from above, is nearly 

 circular, shaped much as in AetJms jjunctulatus, but more broadly and 

 regularly rounded in front, with the central lobe broad, and defined by 

 rather strongly impressed furrows ; the ocelli are large, situated just 

 behind the anterior extension of the thoracic lobes ; the surface of the 

 head is rugulose. Thorax more than twice as broad as the head, and 

 more than half as long again ; the sides rounded, being broadest at the 

 posterior border, narrowing in front and roundly excised at the anterior 

 angles ; front border very deeply hollowed behind the head, leaving 

 prominent front lobes on either side, nearly as large as the head, 

 and strongly mamillate ; hind border nearly straight. The surface is 

 minutely granulate ; besides which there is a transverse belt of rather 

 large and distant punctures midway between the mamillations and the 

 hind border. The scutellum is very large, rounded-triangular, broader 

 than long, and granulate like the thorax. Corium of tegmina, which 

 occupies their greater portion, obscurely and distantly punctulate; 

 abdomen triangular, the apex bluntly pointed. 



Length of body 4™™, of head 0.8™™, of either lateral half of thorax 

 1.35™™ ; breadth of head, 1™™, of thorax, 2.4™™. 



LTG^IDiE. 



(Myodochina.) 



Ehyparocliromus f terreus. — A single poor specimen (No. 4192) appar- 

 ently belongs to this subfamily, but is too imperfect to locate with any 

 precision. The body is of nearly equal width, but with a full abdomen. 

 The head is broken, but is as broad at base as the tip of the thorax, has 

 a rounded-angular front, and its surface most minutely punctulate. 

 The thorax was broadest behind, the sides tapering slightly, and gently 

 convex, the front border broadly and shallowly concave, the hind border 

 straight, more than twice as broad as the median length, the surface, 



