24 PROCEEDINGS OF THE NATIONAL MUSEUM tol. 75 



with membranous parts creamy yellow," chitinous parts, including 

 the prothoracic and pygidial shields, light yellow, cups carrying the 

 setae large and olive green, dorsal sagittal line of thoracic segments 

 not distinct on account of the light color of the chitinizations ; under- 

 side of body creamy white, membranous and chitinous parts having 

 approximately same color; legs light brown with the inner sides 

 creamy yellow and the ends of the joints and the claws darker. 



Setae (fig. 30). — Moderately long, about half as long as a body 

 segment, moderately strong, creamy yellow and capitate; present in 

 limited numbers on the back of the larva and each inserted on top 

 of a small, dark, tubercle-shaped cup. 



Head capsule. — With only a slight, median, unpaired depression in 

 frons. 



Labrum, (fig. 33). — Crescent shaped, about twice as wide as long, 

 slightly emarginate anteriorly in the middle. Discal setae moder- 

 ately long and pointed; marginal setae minute and fine, the two 

 exterior of the row somewhat larger than the others, straight and 

 pointed; a single small seta inserted in front of and another imme- 

 diately behind the interior discal seta. 



Mandible (fig. 29). — ^With five teeth; inner margin behind last 

 tooth projecting into a thin blade with anterior end obtusely 

 rounded; first tooth comparatively strong, with the tip reaching 

 about to the base of second tooth ; second and third teeth the larger, 

 claw shaped, and slender; fourth and fifth small, of the same size, 

 and fused except terminally. Penicillus well developed; two setae 

 located externally, and one seta in the middle of the dorsal side. 



Maxilla. — With lacinia distally carrying a single row of equally 

 long, well developed, distally pointed setae; galea with half a dozen 

 spinelike setae, as many minute setae, and a cone-shaped tactile 

 appendix of about the same length as the longer setae. 



Postlabial hand. — Simple, rounded, not curved forward medianly. 



Prothorax (fig. 24). — Prothoracic shield on each side having an 

 irregular depression with six deep, round pits in the bottom, a trans- 

 verse, shallow groove connecting the depressions of the two sides, 

 and at each end of the sagittal line a small triangular unpaired 

 deepening. Arrangement of setae on each side of the shield as fol- 

 lows : Six setae in two rows in the anterior margin, about three setae 

 laterally and two setae in the posterior margin. Epipleural sclerite 

 large, round, with one primar}' and two or three secondary setae. 

 Prehypopleural and posthypopleural sclerites (=episternum and epi- 

 meron) about of the same size; each with one seta. Eusternal and 



^ In some specimens of this species the creamy color of the skin has changed to a 

 swarthy color, against which tJie whitish chitinizations contrast sharply, giving these 

 specimens a general appearance strikingly similar to the larvae of Monoxia puncticollis 

 (Say). 



