NORTH AMERICAN COLEOPTERA. 11 



whether they actually emerge and walk away to some distance to re- 

 enter the earth or whether they only approach the surface and open 

 a way for the males to find them. The female sent you was found 

 four inches underground, going downwards, with three males follow- 

 ing her." 



Mr. Rivers found one female on the surface nearly dead and too 

 feeble to make a burrow. 



While nearly all the individuals of a brood emerge at the same 

 time it seems that some are retarded, so that of two females of Bick- 

 seckeri, of which I have data, one emerged with the vast majority of 

 the brood Oct. 16, 1886, a second "after a warm rain Dec. 7, 1886, 

 being either a straggler from a deeper burrow, or more probably one 

 that had not been previously found by any male and had approached 

 the surface a second time. A male was near by where the female 

 was found just under the surface." 



After the flight all the specimens disappear, the males dying, or 

 are captured by insectivorous birds and mammals, the females en- 

 tering the burrows to deposit their eggs. 



PL,EO€OMA Lee. 



Proc. Aead. Nat. Sei. 1856, p. 24. 



P. Rickseckeri ii. sp. 



P. flmbriata Lee., Proc. Aead. 1856, p. 24; Pacific R. R. Rep. ix, App. 1, p. 40, 



pi. 1, fig. 13;* Proc. Acad. 1859, p. 71 (describes mouth parts) ; Traus. Am. 



Ent. Soc. 1874, vol. v. p. 82. 

 P. Behrensii Lee. Trans. Am. Ent. Soc. 1874, vol. v, p. 83. 

 P. conjungens n. sp. 

 P. hirticollis Schaufuss, Nunquam Otiosus, Dresden, 1870, vol. ii, p. 51 ; Lee, 



Trans. Am. Ent. Soc. v, p. 83 ; Lee, Pacific R. R. Rep. loc. cit. p. 40, note t 

 P. Ulkei u. sp. 



P. Staff Scliaufuf;s, Nunquam Otiosus, ii, p. 50. 

 adjnvans (Irotch, Check List, 1874. 

 Edwardsii Lee, Trans. Am. Ent. Soc. 1874, p. 83. 



* The outline figure is fair, the antenna is not accurate, and in addition does 

 not belong to fimbriata. 



t The note was evidently hurriedly written, for reasons given, and the speci- 

 mens supposed to belong to fimbriata are hirticollis. 



