PHILIPPINE DIPTERA, II 27 



dusted, with a yellow stripe from the humeri to the front coxae. 

 Metasternum black, with transverse furrows and long and 

 dense pale yellowish pubescence. Scutellum like the thorax, 

 with whitish pubescence at hind border; mesophragma black, 

 with the usual yellow tubercles on each side. Halteres yellowish, 

 with the knob black above. Abdomen provided with a long 

 stalk, which is formed by the first three segments and besides 

 by the basal part of fourth ; it is entirely black, opaque, the four 

 basal segments being dark yellow at sides and below. Front 

 legs entirely yellow, but their coxae black, like those of the other 

 pairs; middle legs with black femora, which have yellow ends, 

 and with yellow tibiae and tarsi; hind legs with the femora 

 black above, reddish below, and yellow at ends with the tibiae 

 yellow, but adorned with a broad black middle ring; praetarsus 

 yellow, with black end, the other joints black; tibial spines 8, 

 6, 6. Wings uniformly but faintly infuscated, a little more 

 intensively at. base and fore border; veins black. 



LUZON, Mountain Province, Baguio (Baker) . 



Note. The species believed to be S. sphecoides, of which there 

 are also specimens from Mount Banahao, differs from S. valdezi 

 only in the following points : The eyes are more produced above 

 and are united for a line longer than the frontal triangle; the 

 head, therefore, seems to be more acute above, viewed from be- 

 fore. The yellow stripes in front of the dorsum and the spots on 

 the postalar calli are entirely wanting or only indicated by a 

 dark yellowish, less distinct trace ; the metasternum is distinctly 

 bluish, more furrowed, and less pubescent. The front legs have 

 the femora more broadly blackish toward the base; the hind 

 tibiae are black, with narrowly reddish base and yellow tip ; the 

 hind tarsi are entirely black, the praetarsi being only narrowly 

 yellow at base. The infuscation of the wings is more intensive. 



148. Toxophora zilpa Walk. 1849. 



One female specimen from Mount Maquiling. Described from 

 China and not recorded subsequently; nearly allied to T. javana 

 Wiedemann from Java, but it seems to be distinguished by the 

 golden, not whitish, abdominal stripes and by the complete 

 transverse band of the same color on the last abdominal segment. 



149. Petrorossia fulvula Wied. 1821. 



Numerous specimens of both sexes from Mount Maquiling 

 and Malinao, Luzon, and Dapitan, Mindanao. Widely spread 

 over the Oriental Region and known to me also from Formosa. 

 The species was originally described as an Anthrax and was 



