88 ZOOLOGICAL EESULTS OP THE EUWENZOKI EXPEDITION. 



The lateral ferruginous stripes on the dorsum of the thorax will suffice to distinguish 

 P. prcedo from the other species of the genus previously described. 



Family S Y R p H i D /E. 



Subfamily Sykphinje. 

 Sykphus Fabr. 

 Syrphus FabriciuSj Systema Entomologi£e, 1775, p. 762. 



Sykphus adligatus Wied. (Plate III. fig. 3.) 



Syrphus adligatus Wiedemaun, Analecta Eatomologica, 1824, p. 35; Aussereuropaische 

 zweifliigelige Iiisekten, ii. 1830, p. 122. 

 2 d c? . Ruwenzori, 6000-8000 ft. {G. F. Scott Elliot). 



AsARCiNA Macq. 

 Asarkina Macquart, Memoires de la Societe royale des Sciences, de 1' Agriculture et des Arts, 

 de LiUe, 1842, p. 137 ; 'Dipteres Exotiques,' ii. 2, 1842, p. 77. 



ASAECINA AMCENA, sp. n. (Plate III. fig. 4.) 



S , $ . — Length (2 specimens) 11-6 mm. ( d ), 12 mm. ( $ ) ; width of head 3-6 mm. 

 ( d ), 3-8 mm. ( S ) ; width of front at vertex in ? 0-5 mm. ; length of wing 10-5 mm. 

 (d), 11-4 mm. ($). 



Face conical. Agreeing with A. rostrata Wied. in general coloration, but Mack 

 transverse bands on abdomen deej)er ; distinguished from both A. rostrata Wied. and 

 A. eremophila Lw. by having no median black stripe on face ; a dark brown semi- 

 circular mark above front edge of buccal cavity ; third joint of antennae dark brown, 

 except loiver basal angle ; wings longer than in A. rostrata Wied., moderately infuscated, 

 colour not intensified at certain spots, first arid second costal cells not darker than 

 remainder of surface. 



Head saff'ron-yellow, upper half of front in 5 bronze-black ; vertical and frontal 

 triangles in s and front in $ clothed with black hair, face and occipital region 

 clothed with chrome-yellow hair, basi-occipital margin clothed with silvery hair ; first 

 joint of antennm ochraceous-bufi", second joint cinnamon-rufous, both joints stout, 

 clothed with black hair, approximately equal in length in 6 , first joint in $ about 

 one-third longer than second ; arista clove-brown. Tliorax : dorsum, except lateral 

 stripe and scutellum, shining bronze-black, lateral stripe and scutellum gamboge- 

 yellow, scutellum clothed with black, remainder of thorax with yellow hair ; pleurae 

 and pectus yellowish pollinose on a bronze-black ground, some yellow patches clothed 

 with long chrome-yellow hair beneath base of wing. Abdomen saffron-yellow ; dorsum 



