AMERICAN COLEOPTERA. 323 



authors speak of that organ as concealed by the epistoma. This is 

 not the case, the labrum is not concealed but is very evident beyond 

 the epistoma and is connate therewith, the suture quite evident in all 

 the species, more especially in ohfusus. (PI. Ill, fig. 23). 

 The following tables give the arrangement of the species: 



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



than apex Sub-Genus IPS. 



Hind tarsi slender; thorax narrower at base Sub-Genus GLISCHBOCHILTJS. 



Sub-Genus Ips. 



Middle and hind tibise % suddenly broader at apical half. 



Black, each elytron with two large red spots obtusns. 



Middle and hind tibise not different in the sexes. 



Body beneath black fasciatus. 



Metasternum and abdomen red Sauguinoleutus. 



Sub-Genus Glischrochilus. 



Sides of thorax distinctly sinuate posteriorly. 



Elytra coarsely punctured, with large discal reddish space enclosing black 

 spots confliientu!$. 



Elytra more finely punctured, black, with short, linear testaceous lines. 



vittatus. 



Sides of thorax gradually convergent posteriorly, straight not sinuate. 



Elytra black, with a subhumeral red spot and a median interrupted fascia. 



cylindricus. 



I. obtusns Say. — Piceous black, elytra each with two red spots, one at 



the middle of base, the other slightly behind the middle. Length .36 .48 



inch ; 9 — 12 mm. 



The males have the middle and posterior tibiae suddenly broader at 

 apical half A small additional segment is also visible, the pygidium 

 truncate at tip and not concave. (PI. Ill, fig. 23, a, b.) 



The females have simple tibiae, pygidium oval at apex and slightly 

 concave near the end. 



In both sexes the elytra agree in the form of the apices of the 

 elytra, they are very slightly oblique in both sexes. 



Occurs in the Middle and Southern Atlantic States. 



I. fasciatns Oliv. — Black, shining, elytra normally with a broad basal and 

 a subapical fascia yellow. Length .16^.28 inch; 4 — 7 ram. 



The males have the small additional segment and the tips of the 

 elytra oblique, slightly prolonged. 



The females have rounded elytral tips. The tibise are not different 

 in the two sexes. 



The markings on the elytra vary from the fasciate form by the gradual 

 decrease of the size of the spots, so that there finally remain two puncti- 

 form spots on each elytron, one basal, the other post-median. 



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