182 PROCEEDINGS OF THE ACADEMY OF [1898. 



Length about 8.0 mm. Width of head 2.5 mm., of front 0.9 mm. 

 (vitta 0.5 mm., geno- vertical plates each 0.2 mm.). Looked at 

 squarely from in front the dorso-ventral diameter of the head is 2.3 

 mm., the vertex extends 0.1 mm. dorsad the eyes, the dorso-ventral 

 diameter of the eye is 1.5 mm., of the bucca 0.7 mm. Third anten- 

 nal joint about li times as long as the second. General color pale 

 olive-green with a hoary coating, legs a yellowish-brown, except 

 that the third, fourth and fifth tarsal joints and the apical part of 

 the second are black. On the thorax, in front of the suture, are two 

 narrow bands, one on each side, between the acrostichal and dorso- 

 central bristles, which have no hoary coating ; these bands broaden 

 cephalad and unite at the cephalic border of the thorax. On the 

 second, third and fourth abdominal segments there is a narrow, 

 median, cephalo-caudal dark brown stripe not represented in the 

 diagram, I, 13, which shows also the arrangement of the abdominal 

 bristles. 



Head. — Color : Genae, geno-vertical plate, facial fossa, vibrissal 

 ridges, posterior orbits and ocellar prominence silvery ; vitta dark 

 brown; bucca olive; transverse impression of the face yellowish- 

 brown with silvery coating. Second joint of antennse yellowish- 

 brown, third joint darker with a hoary coating. Palpi yellowish- 

 brown. Proboscis black. 



Bristles: Trans-frontal, about eight, of which the ventral four or 

 five are of good size and inserted close together, the rest small and 

 scattered. Ascending frontal, one, large. Orbitals, one large at 

 about the junction of the dorsal and middle thirds of the front and 

 one exceedingly minute a little dorsad the large one, no others at 

 all. The bristles at the vertex are somewhat injured, and I can 

 only say that the inner vertical, outer vertical, greater and lesser 

 ocellar, post-vertical (very small), and ciliae of the posterior orbit 

 are present ; nothing unusual can be made out in regard to them in 

 this specimen. Gense naked. Bucca? distinctly separated from the 

 vibrissal ridges ; parallel to the edge of the mouth-opening and a 

 little distance from it is a row of coarse bristles ; near the cephalic 

 end of the bucca about as far dorsad the large bristles of the mouth- 

 edge as they are from the mouth edge itself, are two stout bristles 

 about equal in size to those of the mouth edge ; the rest of the bucca 

 is rather sparsely beset with minute bristles and hairs. Vibrissal 

 ridges : The principal vibrissa and the vibrissal angle are close to 

 the edge of the mouth opening; dorsad the principal vibrissa there 



