264 ENTOMOLOGICAL NEWS. [June, 'lO 



or whether the generic diagnosis agrees with the type species 

 or not. The important matter is to have a known type species 

 for the genus and when an "old" species is mentioned as the 

 type that species should be so taken whatever the author may 

 have thought that species to be. A diagnosis is not necessary 

 to establish a genus, and a diagnosis may be wrong without in- 

 validating the genus. It is therefore not particularly impor- 

 tant and should not be considered as against a statement or 

 fixation of the type. 



It should be stated that what we once gave as a definition 

 of the larval characters of Mansonia* is in reality a charac- 

 terization of the genus Bancroftia Lutz. At that time we had 

 not studied the adults, and the error came through the deter- 

 mination of Bancroftia fascipcs as a species of Mansonia, by 

 Mr. Coquillett, who followed the Theobaldian scale system. 



The species of which we now know the male genitalia or 

 the larvae, or which on other grounds we can place with cer- 

 tainty in Mansonia are the following : 



Mansonia titillans Walker (tropical America). 

 Mansonia fasciol'atus Arribalzaga (tropical America). 

 Mansonia arribalzay<ae Theobald (South America). 

 Mansonia flavcohis Coquillett (Lesser Antilles). 

 Mansonia coticula Dyar & Knab (Panama). 

 Mansonia nigricans Coquillett (Panama). 

 Mansonia ju.rtamansonia Peryassu (Brazil). 

 Mansonia perturbaiis Walker (North America). 

 Mansonia ochropns Dyar & Knab (New Hampshire). 

 Mansonia brcvicelluhis Theobald (Oriental Region). 

 Mansonia aurites Theobald (Africa). 

 Mansonia chrysogona Knab (Philippines). 



A PLANT-DWELLING ODONATE LARVA. A larva collected December 17, 

 1909, in the water among the leaf-bases of a Bromeliad growing at 

 about twelve feet above the ground on a tree at Juan Vinas, Costa Rica, 

 and brought to Cartago, where it has been kept continuously since, in 

 a tumbler of water, transformed April 4, 1910, as Mecistogaster modestus 

 Selys. I hope to publish detailed descriptions later. PHILIP P. CAL- 

 VERT, Cartago, C. R., April 5, 1910. 



* Journ. N. Y. Ent. Soc., xiv., 184, 1906. 



