120 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Thorax black, dark reddish yellow on humeri, most of scutellum, 

 and parts of the pleura. Faint yellowish pattern on pleura forming 

 indefinite pleural stripe. Coxae dark reddish. Femora reddish 

 anteriorly, blackish posteriorly. Tibiae mainly dark rufous, partly 

 black. Tarsi and tips of claws black. Pulvilli and remainder of 

 claws dark reddish yellow. Wings dark yellowish hyaline. Dark 

 brownish band between first and third veins and vena spuria, gradu- 

 ally diffusing with the hyaline area. Costal and basal cells more 

 yellowish. Anterior cross-vein proximal to junction of subcostal and 

 first vein. Calypters dark blackish red. Halteres yellow, partly 

 rufous, brown at base. 



Abdomen black on first segment, midline and anterior margin of 

 second segment, most of third segment, sides of remaining segments 

 and on the genitalia. Golden yellow pollinose on distal margin of 

 first to third segments, sides of second segment, and most of remaining 

 segments. 



Type: Holotype, male, USNM 64482, Yachow, Szechwan, 2,200- 

 5,000 ft., Aug. 21-25, 1930, D.C. Graham. 



This very distinctive species is related to S. maculifrons, and $. 

 philippinensis in having the second abdominal segment yellow with 

 a black midline. 



Siniconops philippinensis (Krbber) 



Conops philippinensis Krober, Philippine Journ. Sci., vol. 34, p. 340, 1927. 



The front of the specimen examined is predominantly black, 

 although basically the front is yellow with a large black area in the 

 center and velvety black laterally and dorsally. The black at the 

 lower lateral margin forms a distinct frontofacial mark. These differ- 

 ences from the description of the type (male) are within the variation 

 seen in Siniconops nigripes and Siniconops microvalvus (formerly 

 placed in Physoconops) . 



Material examined: Philippines, Mount Makiling, Luzon Island, 

 Baker, 1 female, USNM. 



Genus Archiconops Krbber 



Archiconops Krober, Ann. Mag. Nat. Hist., ser. 11, vol. 4, p. 381, 1939. 



Archiconops erythrocephalus (Fabricius) 



Conops erythrocephalus Fabricius, Entemologica systemica . . . , vol. 4, p. 392, 



1805. 

 Conops niponensis Vollenhoven, Versl. Meded. Akad. Wet., vol. 15, p. 10, 1863. 

 Conops nigricans Matsumura, Thousand insects of Japan, Additamenta 2, p. 262, 



1916. 



The specimen from Siam is more shiny and violaceous than the 

 specimens from China and Japan. The specimens from China have a 



