from the liio Xautia, Slate of Vera Cruz. 23 



3. Tomcntum yellow or greenish yellow .... j/ir.nVffHM.-!, L. Tvp. funn. 



(Me.\ico, I'lniidu, \c.) 



Tomentum cinereous punctatu^, Fabr. 



(Cayenne.) 



4. Tomentum yellow to lemon or greenish 



yellow limonus, Towns. 



(Mexico.) 

 Tomentum cinereous inanis, Fabr. 



Bellardi described tlie female of var. Jimonufs (Ditt. Mess, 

 i. p. 59), but gave it no distinctive name. The mexicanus 

 group will be distinguished from T. luteojiavus, Bell., and the 

 group of 7\ fu/vus, Meig. (Euro))c), by the j)roce3s of third 

 aiitennal joint being only moderately developed, not deeply 

 excised and strongly angulate as in T. luteojiavus. 



Asilidae. 

 26. Leptogaster picti'pes, Loew. 



One female, San llafael, June 21. In sweepings. 



Length 7 millim. 



I am quite confident that this is the same species as the 

 male specimen described by Loew from Illinois. Loew's 

 L. varipes, described from a female specimen, is doubtless the 

 same species, ])robably not even constituting a variety. Both 

 are very similar to L. cuhensis, Bigot, but, I believe, distinct 

 from the latter in the colouring of the legs (see von Roeder, 

 Dipt. Porto Kico, Stett. ent. Zeit. 1885, p. o40). Yet it is 

 quite possible that 2>icttpes may have to be considered but a 

 variety of cuhensis. 



In my specimen the antennse are blackish, the knob of 

 lialteres as well as stalk yellowish, and the posterior femora 

 whitish on proximal two thirds, with all the metatarsi whitish. 

 The wings are almost insensibly tinged with fuscous. 



The species from Durango, mentioned by Osten Sacken in 

 the * Biol. C.-A., Dipt.' (i. p. 167), is probably pictipes or a 

 variety of it peculiar to the tableland. 



S3rrpliidap. 



Nausigastek. 



In Section I. of this paper I described as new^ a neotropical 

 species of this genus, N. meridionalis, Towns, (no. 5), long 

 suspected to be distinct, but not heretofore sejjarated from 

 j\^. 2>unctulota, Will. Since then I have taken further 

 specimens of this genus in New Mexico and Texas, in the 

 latter case securing abundant material. From a careful study 

 of this material I am convinced that there are several distinct 



