136 H. C. FALL. 



before the coxa? subequal in length to the longitudinal diameter of 

 the coxa. Mesosternum flat, a little oblique, middle coxse more dis- 

 tinctly separated ; hind coxal plates gradually dilated internally and 

 obtusely angulate. First and second ventral segments longest, sub- 

 equal, connate, the suture more or less obliterated in some species; 

 third and fourth segments nearly equal and about three-fourths the 

 length of the second ; fifth segment a little longer than the fourth. 

 Tarsi rather narrow, fourth joint a little dilated, as wide as long, 

 fifth elongate. 



Three species are indicated in the material at hand, two closely 

 allied from the Pacific region, and one from the Atlantic and Gulf 

 regions, capable of being separated subgenerically from the typical 

 west coast forms. Cornutus has been bred from galls and it is 

 probable that the other species have the same habits. The genus 

 Micranobium, described by Gorham in the " Biologia," represents, 

 says its author, " two types, one resembling a small Cis, the other a 

 very small Anobium striatum." A specimen of the former of these, 

 M. exiguum, sent me by M. Pic, proves to be an Ozognathus; the 

 other is a Petalium. 



Our three species separate in the following manner : 



First ventral suture feebly marked, nearly obliterated at middle, each mandible 

 of the male with an erect horn arising from its base, punctuation and 

 pubescence denser. 



Form stouter, color nearly black (California) 1. cornutus. 



Form a little more elongate, color brown (Arizona) 2. dubius. 



First ventral suture distinct throughout, mandibles of male not horned, punctu- 

 ation and pubescence relatively sparse 3. floridanus. 



1. O. cornutus Lee. — Rather stout, parallel, blackish brown, moderately 

 shining, somewhat sparsely clothed with short, fine, pale, subrecumbent pubes- 

 cence. Head and thorax moderately strongly, but not coarsely punctate, the 

 punctures separated on an average by their own diameters; elytra more sparsely 

 and rather more finely punctate, especially toward the apex. Antenna? rufous, 

 the club frequently blackish, especially in the male. First joint stout, oval ; sec- 

 ond similar but smaller; three, five and seven distinctly elongate; four, six and 

 eight shorter, nearly as wide as long; ninth to eleventh forming a loose club 

 about equal to the preceding joints united ; the ninth elongate-triangular, as long 

 as the three or four preceding ; tenth a little shorter; eleventh longer than the 

 ninth. Prothorax transverse, sides nearly parallel and rather broadly rounded, 

 sinuate before the hind angles, which are sharply defined and right or a little 

 acute; base rounded, sinuate within the angles; disk even or with a faint im- 

 pression each side the middle posteriorly. Elytra a little wider than the thorax, 

 sides nearly parallel. Sterna and parapleural rather densely, evenly punctate; 

 abdomen more sparsely punctured. Legs rufous throughout, or with the femora 

 blackish. Length 1.5-2.8 mm. 



