OF WASHINGTON, VOLUME XII, 1910. 199 



upon the work as final. We note the absence of the genus 

 Dermatobia, of the occurrence of which in the region under 

 consideration there is abundant and overwhelming proof. Two 

 other generic names omitted are Pamntla von Heyden and 

 Scutelligem Spix, both synonyms of Microdon. In the Culi- 

 cidse the genera Gualteria Lutz and Toxorhynchttes Theo- 

 bald are omitted. The genus Gualteria was founded on the 

 species G. osivaldi Lutz, and of this Vcrralliiia insolita Coq. 

 and V. laternaria Coq. are synonyms. The genus "J\i.\or/i\'n- 

 chites was published for the first time with a species included 

 by Howard in his "Mosquitoes" (page 154). The fact that 

 the generic concept was based on the short palpi of the female, 

 and that an American species was assigned to it because the 

 palpi of the female examined by Mr. Coquillett happened to 

 be broken, does not alter the status of the genus. Megarhinus 

 rutila Coq. must be considered the type-species of Toxorhyn- 

 chites and the genus must be credited to Howard and placed 

 as a synonym of Megarhinus. The name Conchyliastes is 

 credited to Theobald ; it was, however, published by Howard 

 (1. c., p. 155), and must be credited to him, regardless of the 

 fact that the name was communicated to him by Professor 

 Theobald in a letter. 



Mr. Coquillett's method of indicating the type species, where 

 synonymy is involved, is unsatisfactory. Instead of indicating 

 as the type the species actually included by the author of the 

 genus, the species of which this is supposed to be a synonym 

 is designated. Should the two names prove later to belong to 

 distinct species, confusion may easily arise. It is true the 

 name used by the author of the genus is added in parenthesis, 

 but the tendency is to obscure the issue. This is well illus- 

 trated in the case of the genus T&niorhynchus Arribalzaga. 

 Coquillett states that Culex titillans Walker is the type "the 

 first species by tautonymy." It is probably true that the first 

 species included by Arribalzaga in his genus Tceniorhynchus 

 is Walker's Culex titillans, but this cannot be proved until 

 the mosquito fauna of the La Plata region has been newly 

 studied, and it is immaterial in this case. Arribalzaga thought 

 he had before him Wiedemann's Culex ta>niorh\nchus and fie 

 so called the insect. By tautonvmy, if we understand the 

 meaning of the word, Culex l&m'orhvnchus alone can be the 

 type species. Therefore the generic name TcBniorhynchus^ 

 in place of preoccupying Mansonia^ becomes a synonym of 

 Acdes as defined by Dyar and Knab. Other examples which 

 show how misleading is Mr. Coquillett's method of indicating 

 the type species are Chaoborus Lichtenstein and Heteron\cha 



