AMERICAN COLEOPTERA. 35 



For the unique in my cabinet I am indebted to Mr. A. S. Fuller, 

 who obtained it from New Mexico. 



I. serratus, Mann. 



This species is introduced to call attention to a curious variety, 

 found by Mr. Crotch, of much greater size than usual. The head and 

 thorax are smoother and more shining, very minutely punctulate, the 

 thoracic margin more broadly reflexed and very irregularly erenulate. 

 The elytra are subopaque and the striae with the usual punctures re- 

 duced to very indistinct longitudinal and transverse wrinkles, the 

 intervals being minutely and not densely punctulate. The specimen 

 is slightly more than an inch long. 



NYCTOBATES, Gudrin: 

 N. snbnitens, n. sp.— Elongate, black, subopaque. Head very minutely 

 punctulate. Antennae with third joint nearly equalling the three following 

 together. Thorax slightly broader than long, apex truncate, base very feebly 

 sinuate, sides moderately arcuate in front, narrowed and slightly sinuate near 

 the base, hind angles acute but not prominent, surface moderately convex 

 sparsely and very minutely punctulate. Elytra broader than the thorax, 

 gradually attenuate at apical third, surface slightly more shining than the 

 thorax with faint rows of minute punctures, the intervals very sparsely and 

 more finely punctured. Body beneath shining, sparsely punctulate, abdomen 

 longitudinally wrinkled. Prosternum between the coxae convex, and elevated 

 in a slight tubercle at tip. Length .70 inch; 18 mm. 



A comparison of this species with either of the others shows a 

 greater length of the third joint of the antennae. The sides of thorax 

 are more arcuate in front and more sinuate posteriorly. The entire 

 surface is less shining and less distinctly sculptured. The prosternum 

 is narrower and convex longitudinally between the coxae and elevated 

 in a tubercle at tip, our other species having the prosternum broader 

 nearly flat and not tuberculate at tip. The mentum is also more con- 

 vex and the anterior angles more distinct. 



The unique in my cabinet was given me by Mr. H. Ulke, who ob- 

 tained it from Arizona. 

 Scotobsenus parallelns, Lee. 



The males of this species have the anterior femora stouter than the 

 iemales, the tibiae slender at basal fourth and the inner margin covered 

 with small tubercles. The middle and hind femora have a silky 

 pubescent space along their lower edge. 



PHTHORA, Muls. 



P. americana, n. sp. — Oblong, ferruginous, shining. Head sparsely 

 punctured. Thorax broader than long, apex feebly emarginate, base feebly 



