frove the Rio Nautla, State of Vera Cruz. 23 
5. Tomentum yellow or greenish yellow .... mexicanus,L. Typ. form. 
(Mexico, Florida, &c.) 
Momentum? CINpreOUS «2, ,2cce sees sss os punctatus, Fabr. 
(Cayenne.) 
4, Tomentum yellow to lemon or greenish 
SE Ops ciacvoeni NG: woes PMT RIT nese 8 we aie limonus, Towns. 
(Mexico.) 
ROMeNtUIM) GIMCTEOUS - fe che sees deca e sess tmanis, Fabr. 
Bellardi described the female of var. monus (Ditt. Mess. 
1. p. 59), but gave it no distinctive name. The meaicanus 
group will be distinguished from 7’. luteoflavus, Bell., and the 
group of T. fulvus, Meig. (Murope), by the process of third 
antennal joint being only moderately developed, not deeply 
excised and strongly angulate as in 7’. luteoflavus. 
Asilide. 
26. Leptogaster pictipes, Loew. 
One female, San Rafael, 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 
LL. varipes, described from a female specimen, is doubtless the 
same species, probably not even constituting a variety. Both 
are very similar to L. cubensis, Bigot, but, I believe, distinct 
from the latter in the colouring of the legs (see von Roeder, 
Dipt. Porto Rico, Stett. ent. Zeit. 1885, p. 840). Yet it is 
quite possible that pict’pes may have to be considered but a 
variety of cubensis. 
In my specimen the antenne are blackish, the knob of 
halteres 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 picéepes or a 
variety of it peculiar to the tableland. 
Syrphide. 
NAUSIGASTER. 
In Section I. of this paper I described as new a neotropical 
species of this genus, VV. meridionalis, Towns. (no. 5), long 
suspected to be distinct, but not heretofore separated from 
N. punctulata, 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 
