FLIES OF GENUS CONOPS — CAMRAS 173 



including facial grooves, blackish. Facial ridges yellowish brown at 

 base of antennae. Orbital margins yellow pollinose. Antennae 

 black. Segment 3 dark reddish. Segment 2 nearly twice length of 

 segment 1. Segment 3 nearly equal length of segment 2. Proboscis 

 blackish, yellow in the middle, about 1% head height. Thorax black, 

 faint yellowish pollinose. Coxae and legs black, yellowish pollinose, 

 tarsi more yellowish. Pulvilli and base of claws yellow. Wings with 

 dark brown pattern extending to the fifth vein and vena spuria, paler 

 apically. Remainder of wing hyaline except stripe along fifth vein. 

 Calypters yellow, halters yellow with brown tips. Abdomen black 

 with narrow yellow pollinose margin between segments 2 and 3, 

 Distal abdomen faint gray pollinose. Segment 6 produced distally to 

 a point, longer than wide. Genitalia dark yellowish. 



Female: Length 15 mm. Similar to the male. Antennae more 

 blackish. Segment 3 equal to segment 2. Face with more yellowish 

 dorsally. Facial grooves more yellowish ventrally. Wings darker, 

 the hyaline areas brownish. Genital segments very distinctive. The 

 theca is very large and thick at the base. Abdominal segment 6 is 

 narrower at the base than at the apex. Transverse segment 7 is 

 concave above posteriorh^. 



Types: Holotype, male (USNM 62428), Maracaju, Mato Grosso, 

 Brazil, May 1937, R. C. Shannon. Allotype (AMNH), Achinamiza, 

 Peru, Oct. 8, 1927, H. Bassler. 



Subgenus Aconops Krober 



Aconops Krober, Arch. Naturg., vol. 83, Abt. a, Heft 7, p. 142, (1917) 1919. 



Wing pattern extending into first posterior cell only narrowly along 

 the third vein. Pollinose mark medial to the humeri extending into 

 the distinct pleural stripe. Antennal segment 3 relatively robust; 

 usually much thicker and as long or longer than segment 2, 



While none of the above characters are peculiar to this group, the 

 combination will easily distinguish its members. Originally this name 

 was used to separate the species with an elongated antennal segment 3, 

 but the present study shows that this results in an unnatural grouping. 



Type: Conops antennatus Krober. 



Physoconops (Aconops) longistylus (Kriiber) 



Conops longistylus Krober, Arch. Naturg., vol. 81, Abt. a. Heft 5, p. 149, 1915. 



This species is characterized by the partly blackish front and yellow 

 cheeks. By analogy with related forms the long third antennal seg- 

 ment is considered variable. The female cotype of pallifrons is 

 referred here as a well marked variety, but may be a new species. 



