96 MEMOIRS ON THE COLEOPTERA 



oblique anterior coxae. Neither of these characters is so important 

 as the purely 3-jointed antennal club of Tisiphone, combined with 

 still longer oblique anterior coxae, but there is nevertheless a vague 

 habitus, supported by many definite characters in common, such 

 as the formation of the pygidium, that seem to show that the genera 

 mentioned might be associated to form a single family with much 

 propriety. 



Macreurops n. gen. 



The type of this proposed new genus is the Europs longicollis 

 of Horn. Its habitus, due to the very elongate prothorax, is quite 

 unlike that observable in any true Europs and this feature is supple- 

 mented by the short and transverse propygidium of the male and 

 unusual development of the terminal pygidium in that sex, and by 

 the form of the scutellum. In all the species of Europs known to 

 me, the scutellum is elongate and more or less laterally compressed, 

 but here it is short, transverse and very broadly obtuse at apex. 

 In addition to these differences, the broadly truncate apex of the 

 prothorax is in advance of the apical angles, or briefly tubuliform, 

 in a manner not noticeable in the genus Europs. There are two 

 examples of longicollis at hand, a male from Washington State and 

 a female, taken by the writer under oak bark at Monterey, California ; 

 it is a little smaller than the male and with noticeably less developed 

 head. 



Bactridium Lee. 



As constituted by Horn, this genus was composite and included 

 three distinct genera; one of these, founded upon striatum Lee., has 

 been defined above under the name Leptipsius. The other two have 

 as types ephippigerum and cavicolle, which belong to the true 

 Bactridium type, in having the head wholly unconstricted at base, 

 the prosternum with a posteriorly oblique impression extending 

 outward from each acetabula, serving as a partial fossa for the 

 anterior femora and apparently wanting in any other generic type 

 of the family, and a peculiar system of abdominal sculpture, also 

 unsuggested elsewhere. The short intermediate segments of the 

 abdomen have each a transverse, very regular series of oval, 

 close-set fovese, presenting a very peculiar appearance. Bactridium 

 is distinguished from Pycnotomina by the obtuse frontal extension 



