86 AMERICAN COLEOPTERA. 



latter tribe. P. areolatus bears a stroug resemblance to certain spe- 

 cies of Tachys. For an opportunity of studying it I am indebted 

 to Dr. Horn. 



Eight specimens of B. rickseckeri have been examined. For the 

 examples in my cabinet I am indebted to Mr. L. E. Ricksecker, to 

 whom it gives me pleasure to dedicate the species, and to Mr. Chas. 

 Liebeck. 



It occurs on the Pacific coast, being known to me from California, 

 Oregon and Washington. 



Group xi. scudderi. 



Maxillse with the outer lobe bi-articulate. Frontal grooves single, 

 straight, parallel ; eyes moderately large and prominent. Elytra 

 with the humeri rounded, the strite entire ; third interval with three 

 dorsal punctures. 



The species of this group may be at once distinguished from all 

 the others in which the dorsal punctures are on the third interval by 

 having the abnormal number of three punctures, a character repeated 

 only in rickseckeri, in which, however, they are situated on the third 

 stria. 



The group is, so far as I am aware, peculiar to America, and is 

 •confined to that portion of our country lying west of the Mississippi 

 River and to Mexico. Three out of the four species occurring in 

 the region treated in this paper have been found in the Salt Lake 

 Vallev, Utah {scudderi, henshmvi and consimile). Of these the first 

 two are also known to me from the Pacific coast, while the last named 

 extends as far east as Nebraska. The fourth ( hageni) was described 

 by Dr. LeConte, under the name sexpimctatum, frqm the valley of 

 the Colorado River, and the unique in his collection is the only 

 specimen known. Two Mexican species, flohri Bates and placitum 

 Bates,* are apparently referable to this group, and from the descrip- 

 tions seem to be distinct from any of our species, which may thus 

 be separated : 



* For descriptions the student is referred to Proc. Zool. Soc, 1878, p. 602, and 

 Biol. Cent. Am., vol. i, pt. 1. October, 1882, pp. 150-151. The former is from the 

 vicinity of the City of Mexico and Oaxaca ; the latter from near the City of 

 Mexico. Both vs'ere described in the first paper under the generic name Notaphus. 



