20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 75 



also light colored with about four setae. Ventrally with a dark 

 subtn angular eusternal sclerite wedged in between and almost fused 

 with 3 pair of dark, rounded and small sternellar sclerites, the com- 

 pound plate carrying two primary setae on each side. 



Mesothorax and mfietathorax (figs. 4, 5, 21.) — Interior prescutal 

 sclerite almost completely fused with the interior sclerite of the 

 opposite side, the sagittal suture only indicated at each end of the 

 compound plate, light colored, six setae; exterior prescutal sclerite 

 distinct, dark colored, about five setae. The interior scuto-scutellar 

 sclerite similar to interior prescutal sclerite but somewhat smaller, 

 light colored, on each side armed with about four setae; exterior 

 scuto-scutellar sclerite large, round, dark colored, with about eight 

 setae. Alar sclerite large, dark, with about 12 setae. Spiracular 

 area somewhat chitinized and armed with a single seta. Epipleural 

 area triangular, with a moderately large, light colored sclerite carry- 

 ing about four setae. Prehypopleural sclerite usually dark, with 

 four setae; posthypopleural sclerite usually light colored, with four 

 setae. Eusternal sclerite weak, with two to three setae on each side. 

 Sternellar sclerite minute, with a single seta. 



First to seventh abdominal segments (figs. 4, 5, 21). — Interior 

 prescutal sclerites fused in the middle line, light colored, with about 

 four setae on each side; exterior prescutal sclerite distinct, dark 

 colored, with about five setae ; between interior and exterior prescutal 

 sclerites a single seta present. Interior scuto-scutellar sclerites fused, 

 light colored, with about four setae on each side; exterior scuto- 

 scutellar sclerite distinct, dark-colored, armed with about three setae. 

 Parascutal area with a distinct but small anterior sclerite and a rather 

 large posterior sclerite; both dark colored, anterior armed with 

 two setae, posterior with about five. Epipleural sclerite rather large, 

 light colored, about seven setae. Hypopleural sclerite rather dark, 

 about four setae. Eusternal sclerites fused or almost fused in the 

 sagittal line, on each side about three setae. Sternellum (plus para- 

 sternum) having one distinct, dark sclerite armed with about two 

 setae. 



Eighth abdominal segment. — Similar to the preceding abdominal 

 segments but not so wide and high as these and with the interior and 

 exterior scuto-scutellar sclerites all fused together into a single com- 

 pound sclerite, armed with about five setae on each side. 



Ninth ahdomiinal segment (figs. 4, 5). — Pygidial shield semicircular 

 in outline with margin thick and set off from the discal part by a 

 groove. Setae numerous, arranged in a single anterior row and an 

 irregular double row in the free margin; a few setae present in the 

 discal part. Ventral part of segment with a transverse, elongate 

 sclerite. 



