410 



BUREAU OF ANIMAL INDUSTRY. 



teeth of the median row on each half on same transverse planes. Palpi thick, 455 fx 

 long (140 yw, 125 110 >a, 180 from first to fourth article); second article llO/^ broad; 



hairs not very numerous on last three 



—f t 



f 



/ 



m 



1 



\ 



7 



Fig. 



i. — Portion of skin, showing spines and hairs. 

 Greatly enlarged. Original. 



articles, six to eight short terminal 

 bristles. Legs long and strong; coxse 

 very short, but broad, almost marginal; 

 other articles cylindrical, relatively 

 short compared with their diameter; 

 ventro-terminal portion of tarsi elon- 

 gate, claws strong, pulvillum absent. 



Hexapod larva. —The hexapod larva 

 is elongate oval, with long terminal 

 capitulum, measuring 0.61 mm. from 

 tip of hypostome to posterior extrem- 

 ity. The tegument is finely striated, 

 and pierced with symmetrically ar- 

 ranged pores, from which bristle-like 

 hairs issue. The palpi and hypostome 

 are of practically equal length; hypo- 

 stome with two rows of denticles on 

 each half; palpi, first article short, sec- 

 ond and third long and equal, fourth 

 short. Between coxaB I and II, and II and III, are found minute spiracle-like^ 

 structures in the cuticle. On the claws is found a small pulvillum-like pad. 



Some of our specimens of 

 this species show a pupa-like 

 stage. They are about 4 mm . 

 long by about 2 mm. broad, 

 rounded white pyriform 

 structures with one end 

 elongate. Closer examina- 

 tion shows the outer cover- 

 ing to be a smooth, cast skin; 

 the cast hypostome has two 

 rows of denticles; three pairs 

 of legs are present, pair I 

 larger and longer than II and 

 III. Inside of this distended 

 smooth hexapod skin with 

 terminal capitulum is found 

 the spinose octopod form 

 with subterminal capitu- 

 lum, and with well-devel- 

 oped claws on the tarsi, and 

 four rows of denticles on 

 each half of the hypostome. 



We have not seen this stage alive, but from the general structure it 



Fig. 99. 



-Ventral view of capitulum of same. 

 Greatly enlarged. 



Original. 



^ Whether these structures are actually stigmata and pulvilli remains to be deter- 

 mined when fresh material can be obtained. 



