328 Journal of Agricultural Research voi. xxii, no. e 



exterior margin of stipes, adjacent to slightly curved hypostomal thickening {hyp) 

 between fossa for ventral mandibular condyle {fm) and fossa for tip of cardo (/c); inner 

 margin of cardo connected like stipes with exterior half {ar ^) of maxillary articulating 

 area. Maxillary articulating area protuberant, soft, divided into two halves; exterior 

 half (ar I) connected with maxilla, subdivided into an upper and low^er portion; 

 interior half (ar^) connected with submentum, entire; no seta. Mentum {me) 

 almost square, side margins free; on each side about five setse of different length. 

 The two stipites labii {stla) fused into a slightly chitinized unit, carrying on each 

 side two setae; labial palp about half as long and half as thick as maxillary palp; 

 basal and apical articles slightly different in length, basal article somewhat clavate, 

 apical article conical and half as thick as basal article; ligula {li) small, narrow conical, 

 with one terminal pair of setae. Hypopharyngeal sclcrite (PI. 32, A, G, H, hsc) 

 elongate rectangular, projecting, strong; anteriorly tricuspidate with median cusp 

 largest; disk somewhat excavate with a posterior semiglobular tubercle; molar part 

 of mandible and hypopharyngeal sclerite grinding together (PI. 31, D, F, G). The 

 hypophar>'ngeal bracon (PI. 32, A, G, H, hbr) is well developed as a chitinous rod in 

 the buccal membrane between the ventral mandibular articulation and the hypo- 

 pharyngeal region. Prothoracic legs (PI. 31, C, H, I; 32, B) considerably stronger 

 than the mesothoracic and metathoracic ones and with coxae attached so closely 

 together that they almost touch each other at base. Coxa of first pair about as long 

 as wide ; many fine , scattered hairs on exterior and interior sm"f aces ; trochanter about 

 as long as coxa, on the inner side (PI. 31, H) distally with two spinelike setae and also 

 with a few other thin hairs; femur {fe) about as long and wide as trochanter, armed 

 with five spinelike setae, also with many thin, scattered hairs; tibia {ti) about twice as 

 long as thick, almost same length as femur but not fully as wide, armed with five 

 spinelike setse and also with fine, scattered hairs; tarsus {ta) of almost same length 

 as tibia, claw-shaped, strong, but rather slender, with backward-facing surface distally 

 excavate and proximally carrying a round soft-skinned region around a short but strong 

 seta; another and similar seta set close to it at the end of the excavation; otherwise 

 no setae or hairs on tarsus. Second and third pairs of legs inserted farther apart than 

 the first pair; the arrangement of their setae very similar to that of the first pair, but 

 the proportional sizes between the articles somewhat different from those of the 

 first pair. Prothoracic eusternum (PI. 32, B, eu) large, rhomboidal, anteriorly almost 

 reaching the front margin of the segment, only separated from this margin by a small 

 presternal area (y); the hypopletu-al chitinization {hi and h-^), and especially its 

 prehypopleural part (A i), large and strong; prothoracic tergal shield siibquadrate, 

 slightly wider than long, with anterior and posterior margins, as mentioned above, 

 darker than the rest of the shield and finely longitudinally striated. Mesothorax 

 and metathorax with transverse, sub triangular, narrow presternum {y), laterally 

 adjacent to poststernellura (2) of the preceding segment; hypopleiiral chitinizations 

 {h I and h n) well developed, but considerably smaller than those of prothorax; 

 poststemellum of metathorax not present, preepipleurum of mesothorax {e i) 

 subtriangular, carrying first thoracic spiracle; preepipleurum of metathorax not 

 distinctly limited, carry'ing the rudimentary second thoracic spiracle; postepipleiuiim 

 (e u) of both segments well developed, more or less fused with the corresponding 

 preepipleura ; mesothoracic and metathoracic tergal shields transversal, subrectangu- 

 lar, about twice as wide as long, right behind anterior margin with a dark transverse 

 line; posterior margin darker than rest of segment, finely longitudinally striated. 

 Typical abdominal segment (that is, one of the eight anterior abdominal segments) 

 with fused sternal and hypopleural areas {ster), covered by a single, longitudinally rec- 

 tangular shield, which posteriorly has a rather dark, transverse, longitudinally finely 

 striated margin; one seta present near the anterior and one seta near the posterior 

 margin; additionally the sternum of first abdominal segment is anteriorly densely 



