26 NATUEAL HISTOEY BULLETIN 



Balaninus Germ. 



B. FLORISSAXTENSIS n. sp. (Plate VI, Fig. 9.) Form stout. Head 

 small, finely punctured, eye elliptical, transverse. Eostrum heavy, very 

 minutely and quite closely punctulate, nearly straight, except near the tip 

 where it is very faintly arcuate. Antennae not well defined, but the point 

 of insertion is about two-thirds from the base. Prothorax, in side view, 

 about twice as high as long, dorsum strongly arched, surface regularly punc- 

 tate, the punctures round and close-set. Elytra with well defined striae 

 of rather approximate elongate punctures. Legs stout, but not especially 

 short, the thighs unarmed. Length, allowing for the breaking of the elytral 

 apex, about 4.00 mm. 



This seems distinct from any of the rather numerous species 

 of Balaninus already known from Florissant. In size it is near 

 B. jemoratus and B. minusculus. From the former it differs in 

 having a longer beak, differently shaped femora, and elliptical 

 instead of circular eyes.. From the latter it may at once be told 

 by the nearly straight rostrum and coarse elytral sculpture. It 

 looks a great deal like Dorytomus ivilliamsi, but that species is 

 said to have toothed femora. The elytral lines, in my figure, 

 show simply the courses of the strige and not their punctuation. 



Xyleborites n. gen. 



Form similar to the recent XyJeborus pubescens but more elongate, the 

 prothorax shorter as compared with the elytra, the thoracic sculpture finer 

 and nearly uniform, eye sub-elliptical. These characters are, of course, not 

 in themselves generic, but they indicate a probable diversity of structure 

 from the modern species of Xyleborus. The type is X. lo7igipennis, de- 

 scribed below. 



X. LONGiPENNis n. sp. (Plate VII, Fig. 7.) Form elongate. Head 

 large, the surface finely roughened or asperate, eye subelliptical, antennae 

 not showing. Prothorax cuneiform, in side view, dorsal arch broken, the 

 front lateral margin bisinuate, surface finely, evenly asperate, not per- 

 ceptibly more so anteriorly. Elytra imperfect at apex but at least two 

 and a half times the prothoracic length, striatopunctate, the punctures 

 well separated, rounded or slightly longitudinal, the interspaces very finely 

 transversely rugose. Legs stout, the middle tibia, the only one well shown, 

 longitudinally carinate. Length, as preserved, 2.25 mm. 



I cannot place this insect in Xyleborus without giving too 

 much latitude to the presumed generic facies. At first sight it 

 looks like some Xylebori or Pityophthori but the prothorax is 

 relatively too short. The best course seems to be its separation 

 by the suggestion of a provisional genus. 



