28 rKOGEEDINGS OF THE NATIONAL MUSEUM. vol. «4. 



obtusely rounded, downward-bent end of body, und not, as in fourth 

 instar, an attenuate, straight and conical one; anus round, facing ob- 

 liquely forward, not posteriorly as in the fourth instar; segments dis- 

 tincly limited, with most of the segmental areas distinguishable, not 

 effaced as in fourth instar, but jnore similar to the conditions of the 

 fifth instar ; tergal areas transversely divided into two folds ; opipleu- 

 ral areas rather large with epipleural lobes round and distinct, not 

 forming a continuous lateral ridge above the veutro-lateral suture; 

 this latter is sharply set off; ventral ai-eas all represented. Legs, 

 three pairs of equal size, as long as in fourth instar, but much tliicker, 

 soft, not fitted for locomotion; femur and tibia distinct; tarsus less 

 so ; coxa indistinct and trochanter lacking. 



Head, rather large and flat, nutant and directed backward, some- 

 what retracted ; head-capsule and appendices obese but distinct, very 

 similar to the same structures in fourth instar; all soft, except tip and 

 condyle of mandible, which are darkly chitinized. 



Head-capsule, dorsally with slightly convex surface and rounded 

 outline ; length, about 1 mm. ; width, 1.25 mm. ; ventral side, behind 

 maxillae and submentum, verj^ short, medianly about 0.12 mm. long, 

 half as long as in fourth instar and much shorter than in second 

 instar ; lateral side of head about 0.75 mm. long. 



Frons, small, anteriorly wide, posteriorly attenuate, lateral margins 

 convex, rather distinctly set off from epicranium by frontal sutures; 

 also a definite indication of a fronto-clypeal suture; separated from 

 foramen occipitale by a distance about half as long as the frontal 

 area itself. 



Clypeus, large, anteriorly about half as wide as posteriorly, lateral 

 margins convex. 



Labrum, transverse, subtrapezoidal, with almost straight anterior 

 margin; the mandibles, maxillae and labium, but not the antennae, 

 projecting in front of labrum. 



Epicranial halves, large, laterally and posteriorly rounded, medi- 

 anly meeting along well developed epicranial suture; hj^postomal 

 margin very concave, half as long as side of cranium; margin be- 

 tween cardo and foramen occipitale short. 



Gular area, short, half as long as in fourth instar, somewhat similar 

 in shape; laterall}^ limited by two gular sutures. 



Ocellus or pigmented optical spot, absent. 



Antenna, conical, distally extending over posterior third of the 

 mandible, three jointed, basal joint much larger than in fourth in- 

 star, somewhat longer than the two other joints together, about 

 as wide as long; apical joint small; supplementarj' appendix same 

 size as apical joint. A few setae on all joints. 



Mandible, triangular, with about equal length and width. Imagi- 

 narv axis between dorsal and ventral articulations located as in 



