Pronotum (Figure 811, A) whitish at anterior and lateral margin, with a 

 narrow light stripe along median suture; other surface chestnut brown, 

 with large dark brown dots: 2 dots posteriorly at median suture, 4 large dots 

 lateral to dark part; posterior margin light, with a large brown spot in the 

 miiddle, a chestnut brown area with a wide,, black margin near lateral margin. 

 Mesonotum (Figure 811, B) with a wide, light, anterior area with a small seta 

 in the middle and 2 small setae at anterior angle; chestnut brown part with 

 509 2 large, dark dots at anterior margin, 2 on surface and 3 at anterior angle; 

 posterior margin with a light stripe which is wider in the middle and with 

 2 large dots. Secondary setae less numerous than in Oe.ochracea. 



(507) 



FIGURE 810. Oecetis la c ust ris Pict. : Head, dorsal (A) and ventral (B) 



Metanotum with a pale sclerite with 8—9 setae in anterior angle, primary 

 seta and one of the secondary setae larger than the others; a row of 8—9 

 large dark setae ventrally in each half. 



Propleuron (Figure 811, C) short; pleural suture black, episternum 

 chestnut brown, with small, indistinct, light spots and black margin; epimeron 

 light, thin, indistinct; trochantin whitish yellow, wide basally, chestnut brown, 

 with narrow, black margin; 5 setae at anterior margin, including a primary 

 distal seta; 11—12 light, moderately long, secondary setae on surface; setule 

 situated subapically. 



Pleurites of mesothorax and metathorax yellowish, narrow, indistinct, 

 with narrow, brownish black, pleural suture; both setae dark, long, situated 

 on the membrane. 



Legs as in Oe.ochracea in size and form; forelegs light brown; mid- 

 and hind legs brownish yellow. Claw with rudimentary basal seta. 



Dorsal process and lateral processes of abdominal segment 1 as in 

 Oe. ochracea. Presegmental gills in a dorsal and ventral row on 

 segments 2—8; postsegnaental pleural gills only on segment 2. Lateral 

 line on segments 2— 7, with small grayish hairs. 



Tergite of segment 9 (Figure 812) whitish, indistinct, without spots; 

 secondary setae absent; primary setae large, blackish brown; medioanal 

 seta thicker than the others; lateral and anterior-angle setae shorter; 

 intermediate and anterior-margin setae short, thin. Sclerite "b" of anal 

 legs light, indistinct, with 5 setae, 2 distal setae thicker than the others, 

 situated above claw, median dorsal seta and both lateral setae brownish, 

 moderately long. 



635 



