NATURAL SCIENCES OF PHILADELPHIA. 377 



Differs from the European A. marginata by its larger size and narrower 

 form. 



On examining a specimen of Lobiopa guttulata Lee, given me by Mr. B. 

 Billings, of Ottawa, C. W., I find that the antennal grooves are slightly conver- 

 gent, and do not follow the contour of the eyes as in Lobiopa undulata and 

 setulosa: it therefore appears to belong properly to Soronia Er. The tarsi 

 in both genera are narrow. 



CYLLODES Er. 



C. biplagiatus, rotundatus convexus, niger nitidus, subtiliter puncta- 

 tus, elytris plaga magna subbasali rotundata rufa ornatis, punctis paulo majo- 

 ribus striatim positis ; pygidio nudo ; antennis rufo-testaceis, clava fusca. 

 Long. 5 mm. 



Two specimens were found on Mount Holyoke, Massachusetts, by Mr. Geo. 

 D. Smith, who has liberally placed one of them in my collection. This species 

 differs from the European Cater by the large red spot on each elytron near 

 the base. 



The genus C y 1 1 o d e s is to be distinguished from the genera of Cychramini, 

 defined on p. 84 of my Classification Col. N. Am., by all the tarsi being di- 

 lated, and the prosternum produced behind the front coxae, covering the me- 

 sosternum in repose, and meeting the metasternum, which is somewhat promi- 

 nent between the middle coxae. The antennal grooves are short, not very well 

 marked, and converge on the under surface of the head. 



PITYOPHAGUS Shuckard. 



P. cephalotes, cylindricus, supra piceo-niger nitidus, fortiter punc- 

 tatus, capite convexo, lateribus pone oculos parvos rectis parallelis, thorace 

 capite baud latiore, latitudine paulo longiore, lateribus rectis, angulis haud 

 rotundatis, apice basique late rotuudato, elytris stria suturali impressa, hu- 

 meris rectis prominulis, lateribus parallelis, apice recte truncatis, pygidio 

 dense puuetato, concavo ; corpore subtus, antennis pedibusque piceo-ferrugi- 

 neis. Long. 5-5 mm. 



One specimen, Columbia, Pennsylvania. This species resembles in form the 

 European P. f e r r u g i n e u s, but differs in color. The sixth ventral segment 

 is quite distinct in the specimen, which is therefore a male. 



RHIZOPHAGUS Herbst. 



R. cylindricus, elongatus cylindricus, transversim valde convexus, 

 piceo-ferrugineus nitidus, elytris postice sensim infuscatis, capite thoraceque 

 fortiter haud dense punctatis, hoc paulo angustiore, latitudine fere sesqui 

 longiore lateribus rectis, angulis posticis rotundatis ; elytris striatim puncta- 

 tis, interstitiis lasvibus, stria suturali postice impressa. Long. 5 mm. 



Mas capite majore, thorace ab apice postice sensim angustato ; abdominis 

 segmento 6to ventrali conspicuo. 



Femina capite haud latiore, thorace lateribus antice posticeque paulo 

 rotundatis. 



Tennessee, Mr. Ulke. Larger and more cylindrical than our other species. 



R. dimidiatus Mann., Bull. Mosc, 1843, 300. I found a specimen on 

 Point Kewenaw, Lake Superior, which does not differ from two Russian 

 American specimens in my collection. 



R. bipunctatus. Colydium bipunctatum Say, Journ. Acad. Nat. Sci., 

 iii. 325. 



Middle and Western States, and Canada. This species in the Melsheimer 

 Catalogue is properly referred to Rhizophagus, but by a strange mistake I 

 have in my edition of Say's Entomological Writings (ii. 183) referred it to 

 I p s, and again in the List of Coleoptera of North America (p. 30), to P i t y o- 

 p hag us. This last error is corrected in the errata at the end of the work. 



1866.] 



