THE CANADIAN ENTOMOLOGIST. 249 



ON SOME GENERA OE STAPHYLINID^E, DESCRIBED BY 



THOS. L. CASEY. 



BY E. WASMANN, S. J., LUXEMBURG. 



i. In his Coleopterological Notices, Y ., p. 594, Mr. Casey described 

 a new genus of Aleocharini under the name of Myrmobiota (crassicornis, 

 Cas., n. sp.) as allied to Homceusa, Kr. The only specimen was captured 

 at Iowa City (Iowa) by Mr. H. F. Wickham. Some time afterwards I 

 received three specimens of an insect very like our Homceusa, under the 

 name of Myrmobiota crassicornis, Cas., one directly from Mr. Wickham 

 (captured at Iowa City, June 6, 1896). two through the kindness of Rev. 

 P. J. Schmitt (captured by Wickham at Iowa City, bearing Wickham's 

 number, 9561). After having compared this species attentively with our 

 Homceusa acuminata, I could not doubt that it belonged to the same 

 genus as the latter. I published a note on this subject in the Tijdschrift 

 voor Entomologie, XLL, 1898, p. ir, declaring Myrmobiota to be the 

 same genus as Homceusa. 



Meanwhile, Mr. Casey described in Journ. New York Entom. Soc, 

 VIII., No. 2, June, 1900, p. 53-54, two new genera allied to Homceusa 

 and Myrmobiota : So/iusa and Dccusa. As to my identification of 

 Myrmobiota crassicornis with Homceusa, he suggested Mr. Wickham 

 might have sent me a So/iusa under the name of Myrmobiota. 



Not knowing yet this last paper, which Casey kindly communicated 

 to me later, I had sent him a typical specimen of our European Homceusa 

 acuminata without indication of locality, and asked him whether this 

 species was not a Myrmobiota. But he answered it seemed to be a true 

 Homceusa, as it was indeed. 



After having studied the comparative description of the genera 

 Homceusa, Myrmobiota, So/iusa and Decusa, and having compared it 

 with my specimens, I can give the following explanation : 



(a) The three specimens of " Myrmobiota crassicornis," from Mr. 

 Wickham, in my collection are indeed So/iusa criuitu/a, Casey, as Mr. 

 Casey has suggested. 



As to the value of Casey's three new genera allied to Homceusa, the 

 following is my opinion : 



(b) Decusa, Cas. (expansa, Lee), is certainly a good new genus, 

 having 10-jointed antennae (Homceusa, So/iusa and Myrmobiota have 

 1 1 jointed antennae), besides other differences ; it was quite necessary to 



