1882.] 



347 



[Jayne. 



Mesosternum broad, emarginate in front or 

 entirely divided, receiving tlie tip of the 

 prosternum, middle coxae widely sepa- 

 rated. 

 Mandibles and labrum not covered by tlie 

 prosternum. 



No antennal fossoe ACOLPUS. 



Antennal fossge distinct TROQODERMA. 



Mandibles covered, labrum not covered by 



the prosternum. 



Antennal fossae under lateral margin of 



thorax. Body pubescent. 



Front rather flat, clypeus continuous 



on the same plane. Antennal club 



of at least two joints CRYPTORHOPALUM. 



Front convex between the eyes, clypeus 

 forming an angle witb the front, re- 

 tracted. Antennal club of one 



large, broadly securiform joint AXINOCERUS. 



Antennal fossae dividing the anterior part 

 of the lateral margin of the thorax. 



Body clothed with scates ANTHRENUS. 



Mesosternum broad, entire. Middle coxae wide- 

 ly separated. Mouth parts covered by 

 sternum, prosternum truncate behind. 

 Posterior coxae not prominent, not reach- 

 ing the sides. Body covered witli very 



long, erect liair APSECTtJS. 



- Mouth parts covered by anterior legs, pro- 

 sternum pointed behind. Posterior coxae 

 attain the sides. Bodj' naked, shining.. ORPHILUS. 



DERMESTES Linn. 



The species grouped together in this genus are the largest and most 

 conspicuous of the entire family. They are all elongate in form, black, 

 more or less pubescent. The head is small and can be retracted within 

 the thorax; the eyes large and, in all 'our species, entire. No frontal 

 ocellus. The antennae are 11-jointed, the last three joints being large, 

 prolonged on their outer side, and forming an irregular club (fig. 7), which 

 does not differ either in the species or sexes. Thejhorax in the first group 

 — including six species — is very convex in front, and the anterior portion 

 of the lateral margin cannot be seen from above, while in tbe second 

 group — pulcher, lardarius, cadaverinus and elongatu$ — it is less convex, 

 the entire lateral margin being visible. The base is broadly lobed ; in the 

 first group, impressed witli a median fovea, conspicuous in marmoratus, 

 hardly apparent in fasciatus; in the second group with two, widely sepa- 



PROC. AMER. PHILOS. SOC. XX. 112. 3r. PRINTED AUGUST 16, 1882. 



