34 Bulletin American Museum of Natural History [Vol. XLII 



matic atrium and bears a large, chitinized plate, somewhat dome-shaped anteriorly. 

 Caudal margin of the eighth tergite is slightly quadrilobed, each lobe with an un- 

 chitinized tin and several distal setse. 



Procercus well developed, its first segment prominent, with a chitinous band 

 partly surrounding it and a distal tubercle as well as a small terminal segment, bear- 

 ing an apical seta. Mesocercus fairly prominent, chitinized, two-segmented, each 

 segment with an apical seta. The chitinous plate in front of the mesocerci distinct 

 and with two transverse rows of setse arranged in pairs; the posterior row with one 

 pair and the anterior row with three pairs; median lobe of ninth tergite rounded and 

 with a ventral chitinized plate which tends to wrap around it. Acrocercus situated 

 below each lateral lobe of the ninth tergite, and with two terminal tubercles, each 

 bearing a seta. 



Full-grown Larva. — Length, 25-27 mm. ; width at the thorax, 5 mm. General 

 color is brownish above and dirtv white below. The chitinized regions are castaneous. 

 When about ready to pupate, it takes on a greenish gray coloration, probably due 

 to the color pigment of the pupa. The head measures 3.25 mm in width and 1.99 

 mm. along the mid-dorsal line. First segment of antenna slightly longer than in first 

 stage, about one-fifth the second. Labro-clypeus inconspicuously crenate. Mandibles 

 stouter, blunter and with the proximal inner tooth not noticeably bifid. Lobe of 

 palpifer very rudimentary; dorsal surface of men turn with scattered setse and four 

 lateral spines which are more prominent; ligula very slightly divided at distal end. 

 Seta in the caudal angle of the mesoscutum prominent. Prostyles or anal append- 

 ages not noticeably longer (1.2 mm.). 



Pupa. — Length, 15 mm. with cerci (curled up); width at the thorax, 8 mm. 

 Sea-greenish except whitish tubercles, styli, cerci and tip of abdomen. Whitish parts 

 become brown as emergence time approaches and metathoracic wings fuscous. 



Head smooth; two supraorbital styli present; two small oval raised areas on 

 each side of the epicranial suture near the vertex. Pronotum smooth, its cephalic 

 margin concave. Styli arranged as follows: three equally long styli, 1 curving back- 

 wards, in a transverse row at the anterior margin at each side; a group of three others 

 similarly arranged but decreasing in length towards the middle, just inside the latter; 

 three in a longitudinal row at each lateral margin; a transverse row of ten at the 

 posterior margin (more slender and less recurved than latter) ; two transverse rows 

 near the middle; the anterior row with four styli, the posterior with three. Meso- 

 and metanotum with a pair of styli in a transverse row. Metathoracic pterothecse 

 visible from above. Tarsi not ending in prominent spines nor tibia? spinous on the 

 outer side. A transverse row of six motory styli on the first seven abdominal tergites, 

 the outer one on each side mounted on a tubercle. Second to seventh pleurites each 

 with a stylus or a tubercle. Eighth tergite with two small, rounded tubercles at the 

 posterior margin on each side of the median line and each bearing a short terminal 

 stylus. Ninth segment terminating in two, superficially annulate cerci, which are 

 2.85 mm. long, divergent, tapering and bifid at their tips. Spiracles raised and 

 prominent. 



!These pronotal styli on the front margin and middle region have no terminal seta. 



