420 Philippine Journal of Science im* 



black-spotted; costal border of 

 wings not dilated at end. 



C. scutellinus Bezzi. 

 q\ Three lower orbital bristles; back 

 reddish in front; femora not 

 black-spotted; costal border di- 

 lated at end. ... C. pubescens sp. nov. 



2. Chaetodacus atrichus sp. nov. Plate I, fig. 1. 



A small species, destitute of prescutellar bristles, very distinct 

 on account of the complete black bands of the abdomen, the en- 

 tirely black face of the male, and the nonciliated third abdominal 

 segment in the same sex. 



Panay, Antique Province, Batbatan Island (R. C. McGregor) . 

 Types in my collection. 



Male and female. — Length of body, 4.5 to 5 millimeters; of 

 wing, 4.4 to 4.8. Occiput shining black, with a complete yellow 

 border, which is a little dilated below. Frons about twice as 

 long as broad; dull yellow, with rather shining, a little paler 

 orbits; a dark middle spot and two dark spots on each side, one 

 at the superior and one at the second of the lower orbital bristles ; 

 ocellar dot shining black and at its sides a dark spot, thus form- 

 ing a more or less distinct vertical crossband; lunula small, 

 shining reddish brown. Antennae a little longer than face, first 

 joint short; entirely reddish, third joint a little infuscated above 

 and at the end ; crista reddish at base. Face shining, hollowed in 

 the middle; in the male entirely black, only the external half 

 of antennal grooves yellowish like the linear cheeks ; in the female 

 pale yellowish, with three black spots, two near mouth border at 

 inner end of antennal grooves and the third just below root of 

 antennae. Jowls narrow, reddish brown, with a small dark sub- 

 ocular spot. Palpi and proboscis reddish, the latter darkened 

 above. Cephalic bristles black ; only two pairs of lower orbital 

 bristles present. 



Mesonotum entirely black and rather dull on the back on 

 account of its punctulation and its short, gray pubescence; 

 smooth and shining on the pleura; breast with whitish hairs. 

 Whitish yellow markings broad and disposed as follows : Humeri 

 entirely; notopleural calli; a broad stripe on each side above 

 root of wings, continued in front of suture with a small spot, 

 and abbreviated behind before reaching scutellum; a broad, 

 triangular spot on mesopleuron, which ends with a small spot 

 on the upper part of sternopleuron ; a double, contiguous hypo- 

 pleural spot. Scutellum entirely whitish yellow, with only the 

 apical pair of bristles. Mesophragma entirely black like back 



