DIPTEKA. 297 



THEREVmS! (p. 162). 



PSILOCEPHALA. 



Psilocephala, Zetterstedt, Ins. Lapp. p. 525 (1840). 



1. Psilocephala univittata. 



Psilocephala univittata, Bellardi, Saggio etc. ii. p. 90 \ 



Hab. Mexico, Xucumanatlan, Aumla, and Omilteme, all in Guerrero, 6000 to 8000 

 feet (H. H. Smith), Puebla 1 . 



Three females and five males. Bellardi described the female. The males agree so 

 closely with Wiedemann's description of P. notata that I do not feel sure that the 

 present species is really distinct. Coquillett, in his Table of the North-American 

 forms, distinguishes P. notata as having the silvery dust on the lower part of the front 

 meeting above the antennae, which is hardly the case with these Mexican specimens. 

 The legs are black, with the hind tibiae yellow. 



2. Psilocephala festina. 



Psilocephala festina, Coq. Canad. Entom. xxiii. p. 225 \ 



Hab. United States, Florida 1 . — Mexico, Dos Arroyos in Guerrero, Vera Cruz 

 (H. H. Smith). 



Four female specimens, which agree with Coquillett's description, save that the 

 abdomen is almost wholly deep black and the tibiae are reddish (not yellowish). A 

 single male, from Tabasco, differs from the others in having the black stripes of the 

 mesonotum narrower and less distinct, and the posterior margin of the abdominal 

 segments yellowish ; the whole abdomen, moreover, is silvery-pubescent. 



CYRTDXE (p. 163). 



PHILOPOTA. 



Philopota, Wiedemann, Aussereur. zweifi. Ins. ii. p. 17 (1830). 



This genus was not represented in the collections reported upon by Osten Sacken in 

 the earlier part of this work. 



1. Philopota lugubris, sp. n. (Tab. V. figg. 12, 12 a, 6 .) 

 Deep black, with yellow markings. Frontal triangle silvery- white-pubescent. Antennae black. Labium 

 short, black, the proboscis otherwise light yellow. Prothorax above yellow, its median line brown. 

 Mesonotum and scutellum brassy-black, finely punctulate, moderately shining : on either side of the 

 mesonotum in front a yellow spot connected with the yellow of the pronotum ; post-alar callosities 

 yellow. Mesopleura3 silvery-pubescent. Abdomen black, silvery-pubescent ; first four segments with an 

 interrupted yellow band on the posterior part, that on the second forming two large subcrescentic spots, 

 the others narrower ; on the fifth segment a narrow yellow hind border ; all these segments with the 



biol. cente.-amer., Dipt., September 1901. 2 q 



