THE CANADIAN ENTOMOLOGIST. 287 



observations. Often what I, judging from size only, considered were 

 nymphs in the third stage would prove to be mature females and com- 

 mence egg-laying. 



The formation of the egg-sac, the number of eggs laid, and the 

 external characters of the adult female, have been so well described by 

 previous workers as not to need repetition here. 



BOOK NOTICE. 



Kirby's Catalogue of Orthoptera. — Vol. II. 

 By A. N. Caudell, U. S. Nat. Museum, Washington, D. C. 



Volume two of this most excellent general catalogue of Orthoptera* 

 comprises a well-bound volume of over five hundred and fifty'wellprinted 

 pages. In it 154 genera of crickets (Achetidse) and 689 genera of 

 katydids and allies (Phasgonuridse) are listed, together with their species. 

 The Achetidee as here used corresponds with the more commonly used 

 name Gryllidae, while the name Phasgonuridte is used instead of the more 

 familiar name Locustidse. The reason for the change of Gryllidje to 

 Achetidas is not clear to me. As in the first volume, the types of all 

 genera containing more than one species are indicated. 



As of interest to North American students of this order, the following 

 facts bearing on United States genera and species may be noted : 



LocuSTiD/E (Phasgonuridse). 

 Microcentrum, Scudd. — This genus is used for the insects hitherto 

 usually placed in the genus Stilpnochlora, which is here sunk in synonymy 

 under Mia-ocentriim. Kirby specifies his number 2, thoraciaini, Serv., as 

 the type, but erroneously so, as neither this species nor any of its synonyms 

 are among the originally included species. Personally I should favour 

 taking the first species, retinervis, as type, thus preserving the commonly- 

 accepted nomenclature. By elimination the type is marginelhttn, Serv., 

 which Kirby records only from S. and Cent. America and the West Indies. 

 North America should be included, as Microcentrum thoracicum, Scudd., 

 one of its synonyms, was described from the United States, and I have two 

 specimens from Florida that agree with ones from Cuba. I also have eggs 

 from Florida, showing the species to be a permanent resident there. 



*A Synonymic Catalogue of Orthoptera. By W. F. Kirby, Vol. II, Orthop- 

 tera Saltatoria, part I (Achetida; et Phasgonurida;). London, iqo6. 

 August, 1907 



