Vol. XXvii] ENTOMOLOGICAL NEWS. 369 



Anterior legs very small and with small, slender claw. Middle and 

 posterior legs very large and stout, with large, heavy claw. 



Abdomen elongated oval, widest near the middle, very weakly chi- 

 tinized and thickly beset with slender spines, which are so arranged that 

 a narrow, bare area is left on each side, about half way between the 

 meson and the lateral margin. All the spines very slender and irregu- 

 larly arranged except for a more or less regular, transverse row near 

 the posterior margin of each of the first three segments which are con- 

 spicuously larger and stouter than the others. Chaetotaxy of the ven- 

 tral side very similar. Gonopods practically obsolete, their positions 

 marked by tufts of spines, and behind each gonopod is a thick cluster 

 of spines. 



$. Length (cleared specimen), 2.2 mm. Very similar to the female, 

 except for a noticeable reduction of the number of spines. Genitalia 

 quite conspicuous, the basal plate short and rather broad, the para- 

 meres about half as long as the basal plate, rather weakly chitinized, 

 slightly expanded posteriorly. There are no chitinous supporting 

 structures as in E. horridus. 



Immature stages. There are apparently three immature stages, dif- 

 fering from each other only in the increasing number of spines on the 

 abdomen in each successive stage, but all differing very markedly from 

 the mature form. In several instances the developing structures of 

 one stage are visible within the body of the preceding stage and the 

 sequence can thus readily be made out. Aside from the reduced num- 

 ber of spines all these stages differ from the adult in the extremely 

 heavy chitinization of the skeletal elements of the head and thorax, 

 the presence of numerous short, heavy, almost wart-like spines on head 

 and thorax, the prolongation of the forehead and the small, weak 

 claws. Figure 3, which is of the youngest stage found, obviates the 

 necessity of an extended description. 



T radical system. There are present seven pairs of spiracles, one 

 pair on the mesothorax and six pairs on the abdomen. The segmenta- 

 tion of the abdomen is so faintly indicated that it is impossible to de- 

 termine upon which segments the spiracles are borne (apparently they 

 are on the third to eighth) and also, owing to the conditions under 

 which the specimens were preserved it is difficult to speak with cer- 

 tainty of the distribution of the tracheal trunks. The occluding appara- 

 tus of the spiracles, however, presents some points of considerable in- 

 terest. 



All the spiracles, including the mesothoracic pair, are very small, so 

 very small indeed that it is difficult to distinguish the openings. All 

 are closed by the same type of apparatus. This consists of three chi- 

 tinized pieces, a very small triangular piece that seems to border one 

 side of the spiracle and that lies between the curved tips of two elon- 



