8 DIPTEEA. 



PAKATROPESA. 



Paratropesa, Schiner, Verh. zool.-bot. Ges. Wien, xvi. p. 932 (1866) ; Reise d. Novara, Zool. iii. 

 Abth. i. p. 44, t. 2. f. 2. 



l. Paratropesa praeusta, sp. n., <? 2 . 



Head and thorax reddish-yellow, the latter with three dark stripes ; wings yellowish, with a brown, incomplete 



cross-band in the middle, the apex pale brown. 

 Length of the body, 8-9 millim. 



Hab. Mexico, Jala pa (Bilimek), Orizaba (Sumichrast). 



Head reddish-yellow; palpi and the flagellum of the antennas brownish. Thorax 

 reddish-yellow, with three black stripes ; the intermediate one not encroaching upon 

 the collar anteriorly, the lateral ones connected in front of the scutellum (in one of the 

 specimens the stripes are reddish-brown) ; scutellum yellow ; metathorax black in the 

 middle, yellow on the sides ; the greater part of the pleurae and pectus black ; stem of 

 the halteres brownish, the knob yellow. Front coxae and femora reddish-yellow, except 

 the distal third of the latter, which is black ; front tibiae and tarsi brownish, darker 

 towards their tips ; middle legs (including the coxae) reddish-ferruginous ; tarsi brown, 

 except the basal joint, which is more reddish ; hind coxae black ; hind femora and 

 tibiae reddish-ferruginous ; hind tarsi dark brown. Abdomen in the male black at the 

 base, as far as the middle of the second segment, the remainder reddish-yellow, with a 

 black cross-band on each segment, the genitals black ; in the female the black prevails 

 over the yellow so much that the abdomen may be described as black, with yellow hind 

 margins to the segments, the ovipositor is ferruginous. Wings tinged with yellow; a 

 brown cross-band between the tip of the first longitudinal vein and the great cross-vein, 

 a faint cloud connecting it with the hind margin ; a pale brown shadow occupies the tip 

 of the wing : it is bounded by the perpendicular branch of the second vein, the cross- 

 veins at the end of the discal cell, and the last of the three veins issuing from that 

 cell. — A male and a female in the Museum in Vienna ; a male in Bellardi's collection. 



LIMNOPHILA. 



Limnophila, Macquart, Hist. Nat. Dipt. i. 1834; O. Sacken, Proc. Acad. Phil. 1859, p. 231; 

 Monogr. &c. iv. p. 196. 



1. Limnophila luteipennis. 



Limnophila luteipennis, 0. Sacken, Monogr. &c. iv. p. 217, t. 2. f. 10, & t. 4. f. 25 \ 



Hab. United States \ from Canada to California. — Mexico, Northern Sonora 

 (Morrison). 



2. Limnophila tenuipes. 



Limnophila tenuipes, (Say) O. Sacken, Monogr. &c. iv. p. 210 \ 



Hab. United States l and Canada, common. — Mexico, Northern Sonora (Morrison). 

 A single male. 



