72 INSECUTOR INSCITLt MENSTRUUS 



dark impression on its outer half ; medianly on the disk there are three 

 oblique paler furrows running from the median depression through the 

 dark stripes posteriorly and outwardly and ending in the pale ring of the 

 ocellar spot ; sides before and anterior margin of disk light ; hind part of 

 disk dark, with lighter impressed prescutellar area. Scutellum dark at 

 base in a semilunar spot, border light greenish gray in dorsal view, the 

 colors shifting with the light ; all dark parts with whitish reflection, black 

 rings at bases of bristles most obvious in the light area. The vestiture of 

 thorax consists of black, white reflecting, narrow curved scales in not very 

 dense position, one median very small nude line and two broader ones 

 corresponding to the longitudinal furrows ; prescutellar area smooth ; two 

 medicm rows of coarse black bristles with golden luster, these begin 

 simply at the sides of the black stripes and multiply behind ; a lateral short 

 row above the base of the wings, irregular bristles before the ocellate spot 

 and a double row of long coarse bristles at the anterior margin. Scales 

 of scutellum much smaller and more bristle-like than those of mesonotum, 

 evenly tapering toward the tips, which shine white and give under feeble 

 enlargement the impression of minute hairlike white scales. 2X3 long 

 bristles present on midlobe, four long and some shorter ones on side lobes. 

 Macroscopically the side view gives an almost greenish impression, the 

 integument being of greenish gray color, with the most prominent parts of 

 pleurae and coxae darkened and with whitish reflections. A longitudinal 

 row of bristles on every coxa and some flat gray scales, the first coxae 

 with two more bristles behind ; pleurae with rows and tufts of hairs. 



Abdomen dark above, dull greenish white beneath ; length 1 .2—2. 1 

 mm. ; broad scales above black with strong coppery luster, dull white 

 beneath, at tip of seventh tergite with coppery luster in some lights, 

 eighth mostly dark beneath with bronzy reflection. First tergite dorsally 

 dark on basal half, light greenish gray on apical, with numerous long 

 coarse black bristles, the light color medianly interrupted by a tuft of dark 

 coppery scales and fine hairs ; lateral parts entirely nude, light greenish, 

 shining white. Second and third segments dorsally with basal white spot. 

 As the scales have the iridescent character of the sabethine group, some 

 raised or turned scales here and there glisten white and in some speci- 

 mens give the impression of scattered white scales. The distribution of 

 dark and light beneath and black and coppery above varies widely with 

 differences in light and the contraction of the abdomen. The abdominal 

 bristles are scattered on the venter, almost confined to the apical rows 



