AMERICAN COLEOPTERA. 133 



NITIDULID.?^. 



IPS, Fab. 



Our species formerly known under the name Ips have been placed 

 under the more recent name Pityophagus in the " Check List." With- 

 out desiring at this time to discuss the vexed question of priority and 

 the correctness of the use of the name Ips by Fabricius, it has seemed 

 to me desirable to place before the American students a condensed 

 review of our species. 



I cannot agree with the author of the " Check" List" and with 

 Reitter (Verhand. des Naturf. Vereines in Briinn XII.), in uniting all 

 the species under one generic name, believing that the general form, 

 the structure of the head and the eyes distant from the thorax are 

 characters of generic value. 



Ips. — Body oblong oval, depressed; head broader than long, deeply 

 inserted in thorax, eyes close to the angles of thorax. Elytra without 

 sutural stria. 



Pityophagus. — Body sub-cylindrical; head nearly as long as broad, 

 prolonged behind the eyes which are distant from the thorax. Elytra 

 with sutural stria. 



Our species of Ips are as follows : 



Hind tarsi nearly as broadly dilated as the anterior, thorax broader at base 



than apex Sub-Gen. IPS. 



Hind tarsi slender not dilated, thorax' narrower at base than apex. 



Sub-Gen. GLISCHROCHILUS. 



Sub-Genus Ips. 

 Middle and hind tibiae % with the lower half suddenly broader. 



Body black, elytra each with two large red spots obtlisns. 



Middle and hind tibise not broader, similar in the sexes. 



Body beneath black Tasciatus. 



Metasternum, abdomen and pygidium red sanguiuolentus. 



Sub-Grenus Glischrochilus. 

 Sides of thorax distinctly sinuate in front of hind angles. 



Elytra reddish yellow, apical fourth, margin and humeri black; at middle 

 a round black sjwt joining the margin, base of suture and a small round 



spot on each side black v couflueiitiis. 



Elytra black with pale linear spots, one basal, one ante-median and two 



side by side post-median rittatus. 



Sides of thorax gradually narrowed to base not sinuate. Form elongate, legs 

 rufo-piceous J elytra black with a moderately large sub-humeral red spot and 

 a median interrupted fascia cyliudricns. 



I. obttisus Say. Bost. Journ. I., p. 168. 



Very little variation occurs in ornamentation, which consists of two 

 large red spots on each elytron, one slightly within the humeral angles 

 the other post-median. Length .36. — 48 inch; 9 — 12 mm. 



