xii, D, 3 Bezzi: Studies in Philippine Diptera, II 127 



Nearly allied to the species that in the first century, No. 17, 

 I assumed to be S. sphecoides Walker, but differing in the pat- 

 tern of thorax, which shows four yellow spots at the four angles 

 of the dorsum, and in the legs being much more yellow. 



Female. — Length of body, 16 millimeters; of wing, 13. Oc- 

 ciput black, gray-dusted; ocellar tubercle dark reddish; eyes 

 less produced above, united for a distance as long as the frontal 

 triangle; the latter blackish, white-dusted on middle, yellow 

 below on the antennal tubercle; face pale yellow, with whitish 

 hairs; jowls whitish with shining white dust and with hairs; 

 mentum yellow, with long whitish beard. Antennae black, the 

 first joint narrowly yellow at base, with blackish hairs, more 

 than three times as long as the second; third joint wanting in 

 the type. Palpi yellowish ; proboscis black, but reddish below on 

 the apical half. 



Thorax black, opaque, finely punctulate, with three less dis- 

 tinct, broad, longitudinal grayish stripes; humeral calli yellow, 

 and above them a broad yellow stripe, which is produced inward, 

 reaching almost the middle line of dorsum ; on the postalar calli 

 there is a broad, triangular yellow spot; pleurae black, gray- 

 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 



