Casey — A Revision of the American Paederini. 159 



twice their own length from the base; sides almost perfectly straight, 

 the angles somewhat obtuse but scarcely at all rounded; second anten- 

 nal joint almost as long as the next two combined and much thicker, 

 prothorax almost as long as wide, scarcely narrower than the 

 head, but just visibly narrower at base than at apex, the sides 

 nearly straight, the angles scarcely at all rounded; elytra quad- 

 rate, parallel, much wider than the head, a fifth wider and one-fourth 

 longer than the prothorax. Length 1.75 mm.; width 0.33 mm. Alabama. 



delicatnla n. sp. 



The male sexual modification of the sixth ventral is very 

 nearly as in Sciocliaris, being obtusely cuspidiform, with 

 widely flaring arcuate sides of the emargination, but the 

 apical margin of the fifth segment has a broadly rounded 

 coplanar lobe, about a seventh as wide as the segment, pro- 

 jecting from the middle, which lobe is suggested by the very 

 feeble bisinuation of the edge in some forms of Sciocliaris. 

 Other species of this interesting genus will doubtless be dis- 

 covered in the course of careful collecting. 



Tracbysectus Csy. 



This genus also has but a single known species, which is 

 widely distributed throughout the colder parts of the North 

 American continent, east of the Rocky Mountains. It may 

 be readily known by its coarse and confluent sculpture and 

 short tarsi, the first four joints of the posterior equal and the 

 anterior slightly dilated : — 



Rather stout, parallel, moderately convex, blackish-piceous, the elytra — 

 rather broadly at tip, — antennae toward base and legs, rufous; prothorax 

 also generally rufescent; surface feebly shining, densely sculptured, 

 the head coarsely, with the punctures elongated by compression, the 

 pronotum longitudinally rugose, the hairs borne from the minute gran- 

 uliform punctuLjs along the middle of the depressions or at the middle 

 of the cephalic punctures, the punctures of the elytra spar.-er and 

 smaller, asperate, of the abdomen extremely minute; head well devel- 

 oped, as wide as the elytra, a little wider than long, parallel and 

 straight at the sides, the angles broadly rounded; eyes moderately 

 developed, convex; prothorax much narrower than the head, obtrap- 

 ezoida], wider than long, the anterior angles obtuse but only slightly 

 rounded; elytra quadrate, parallel, a flflh wider and two-fifths longer 

 than the prothorax. Length 3.5 mm.; width 0.8 mm. Rhode Island 

 and Virginia to Iowa and Minnesota conflaens Say 



