MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 365 



Records. — The following is the only record known to me : 

 Trinidad: Maracas Valley (Weber, in M.C.Z.). 



Spcciinens examined. — I have seen only the unique type. 



Remarks. — I know of no other staphylinid that can be confused 

 with this. It differs from Myrmecosaui'us by the shape of the head 

 and the absence of ridges and from all others by the verrucose 

 sculpture. 



I have received no record of its habits. 



LVI. Genus ASTENUS Stephens 



Astenus Stephens, 1832, p. 275. 



Junius EuicHSON, 1839a, p. 523 (not Stephens, 1829). 



Subgenus Mecognathus Wollaston, 1854, p. 595. 



Suniopasler Reitter, 1009, p. 151. 

 Subgenus tfeognathus Sharp, 1874, p. G9. 

 Subgenus Astenognathus Reitter, 1909, p. 150. 

 Subgenus Eurysunius Reitter, 1909, p. 149. 



Genotypes. — Staphylinus angustatus YfihTicms^Astenus angm- 

 tatus (Fabricius) (designated by Westwood, 1838) ; the designation 

 of l>runneus Stephens by des Gozis, 1886, cannot stand ; the designa- 

 tion of Blackwelder, 1939, was made in ignorance of that of West- 

 wood and in oversight of that of des Gozis. Of Suniiis, /Staphylinus 

 angustatus Fabricius =/S''W.mw5 angustatus (Fabricius) (designated 

 by Blackwelder, 1939) ; of Astenognathus, Sunius himaculatus 

 ^v\ch&OTi= Astenus {Astenognathus) himaculatus (Erichson) (desig- 

 nated by Blackwelder, 1939) ; of Eurysunius, Sunius paradoxus 

 ^Y)pelsheim= Astenus (Eurysunius) paradoxus (Eppelsheim) (desig- 

 nated by Blackwelder, 1939) ; of Mecognathus, M. chimaera 

 Wollaston (monobasic) ; of Suniogaster, Sunius ampUventris 

 'Reitter =Astenus (Suniogaster) ampUventris (Reitter) (monobasic) ; 

 of Neognathus, N. angulatus Sharp (monobasic). 



Diagnosis. — Very slender and elongate, moderately convex ; 

 antennae posteriorly flexile, not strongly geniculate, basal segment 

 not much elongate, slender; eyes prominent; head not grooved be- 

 hind the eyes; labrum short and very wide, bidentate; gular sutures 

 imited throughout; third segment of maxillary palpus enlarged but 

 not subspherical, fourth subulate; neck not very slender; prothorax 

 not prolonged in front; prosternum prolonged posteriorly between 

 and under coxae and laterally as far as the hypomera with which it 

 is connate; l\ypomera somewhat prolonged in a lobe behind the 

 coxae; anterior coxal cavities o\)e\\ behind above but closed beneath 

 by the sternal processes; anterior coxae large, exserted; middle 

 coxal cavities confluent; posterior coxae contiguous, "conical"; first 



