ROLAND HAYWARD. 15 



ever, an exception, the grooves in that species being h)ng and ex- 

 tending forward on to the epistoma. 



Both supra-orbital setae are present in all our species. In three 

 European species, liowever, the anterior is wanting; while in one 

 both setae are absent. These all belong to the subgenus Leirides. 



The form of the prothorax, whether wider or not in front of base, 

 is of great importance in the arrangement of the subgenera, while 

 several useful characters are afforded by that member for the sepa- 

 ration of species. 



No characters higher than specific are derived from the elytra. 



From the under side of the body several useful characters are 

 derived. In most of the subgenera the prosternum is distinctly 

 margined at tip, the margin being absent, however, in two of those 

 occurring in our fjiuna, Cyrtonotus and Leironotns, as also in Lei- 

 rides, of which we have no representative. In several groups of 

 Celia the tip of the prosternum is furnished with setigerous punc- 

 tures. These are usually two in number, but in the obesa group as 

 defined by Dr. Horn, which is the equivalent of Percosia Zimm., 

 the tip is plurisetose. I have not detected these punctures in our 

 other subgenera. The punctuation of the sterna and their para- 

 pleurae, as well as of the ventral segments, is often of service, but in 

 some instances the value of tliese chai'acters has, I think, been over- 

 estimated. Leirides has been separated by Putzeys on tlie form of 

 the metasternal episterna. 



Tlie legs afford several ciiaracters of value. Tricena is defined by 

 th.e trifid terminal spur of the anterior tibiae, the spur being simple 

 in tlie other subgenera. The number of setigerous punctures along 

 the inner margin of the femora has often been of service. In Cyrto- 

 notus the posterior tarsi, whether grooved or not on the outer side, 

 have aided in the separation of species. 



The secondary sexual characters are well marked. In all our 

 species the first thi-ee joints of the anterior tarsi are more or less 

 dilated in the males and biseriately squamulose beneath. In most 

 of them the last ventral segment has one setigerous puncture each 

 side of the apex in the males, two in the females. Tlie only excep- 

 tions among our species occur in the subgenus Celia, a moderate 

 number of which have two setae each side in both .sexes. Several 

 other characters occurring in the males of certain species may be 

 mentioned. These consist chiefly in the dentation of the middle 



TKANS. AM. KNT. SOC. XXXIV. JANUARY. 1908. 



