large, light, directed inward. Seta 7 situated ventral to antenna, slightly 

 larger than the lateral seta, light; seta 9 situated slightly anterior and medial 

 to eye, reddish brown, strong, moderately long; seta 11 situated behind 9, 

 small, thin; seta 10 lateral to anterior margin of eye, light; seta 14 situated 

 behind eye, strong, moderately long, dark brown; seta 12 lateral to eye, thin, 

 moderately long, brown; seta 13 almost as long as 12, procumbent, directed 

 antei-iorly, situated slightly behind and lateral to seta 14; seta 15 long, thili, 

 yellowish brown, longer than 14; seta 16 situated slightly posteriorly, strong, 

 reddish brown, moderately long, directed inward; seta 17 lateral to fork of 

 frontal sutures, long, strong, reddish brown, larger than the other setae; setae 

 behind eye situated at margin of flat area between tuberculate and smooth 

 parts of head. Ventral seta 8 short, light; seta 18 small. 



Labrum short, uniformly reddish brown; posterior-angle sclei-ites darker; 

 seta 1 in form of lai^ge, blunt, light spine; seta 2 thinner-, slightly longer, 

 light; seta 4 thin, light, spine -shaped, situated laterally at posterior margin 

 of median depression; seta 3 short, light, situated near anterior-angle 

 sclerite; setae 5 and 6 thicker, large, reddish brown. 



Mandibles short, brown; teeth situated distally, small, except larger 

 median tooth; dorsal blade of left mandible with 2 small, widely spaced 

 teeth; ventral blade with one tooth; dorsal blade of right mandible with 

 2 teeth in addition to distal tooth; ventral blade with one tooth; lateral 

 setae light, relatively large, reaching end of mandible; dorsal seta slightly 

 lai'ger than venti'al. 



Sclerites of cai-do dark reddish brown; seta short, strong, brown; 

 2nd (lateral) seta small, light. Sclerites of submentum in form of 2 wide, 

 oblique, brown plates; seta strong, brown, moderately long. Stipes yellowish 

 brown, setae strong, moderately long, of equal length. Palpifer reddish 

 brown; both setae on membrane, distal seta short, strong; median seta 

 small, light. Palp short, basal segment larger than 3 following segments, 

 which are of almost equal length. Mentum reddish brown, forming a wide 

 semicircle; ventral rods large, brown, seta small, thin, light. Labial palps 

 situated on an elevation, with a brown sclerite; sensillae large. 



Pronotum (Figure 635, A) mainly light chestnut brown; anterior and 

 posterior parts differing only slightly in color, in contrast to B. subnu- 

 bilus; transverse ridge in form of a dark reddish brown stripe; surface 

 behind it only slightly darker than anterior surface; light dots in posterior 

 part less distinct than in B. s u bn u b i lu s. Anterior margin in form of 

 nai-row, smooth stripe, no darker than surface; posterior margin wide, 

 separated anterioi-ly by a blackish brown groove, posterior margin blackish 

 brown in middle, dark brown laterally; margin with light dots. Anterior 

 margin with 6 regularly spaced, moderately long, strong, brown setae; 

 5—6 shorter, thinner setae between and lateral to them; margin also with 

 7—9 small, thin, light, spai-se setae, and a row of minute, pale spinules; in 

 middle on the ridge a long, brown medioanal seta; 3 light setae laterally, 



2 of them short, and a thicker, moderately long, 3rd seta between them. 



Tergites of mesonotum brown; light dots on median tergites less distinct 

 than in B. subnubilus; tergites with 3—4 brown, moderately long setae 

 near anterior margin, one (primary) larger than others; 4 long, including 



3 primary, setae near posterior margin; lateral tei'gites with an anterior- 

 angle group of 5 setae and an oblique row of 8 setae, 5 of them long, reddish 

 brown. 



475 



