GENUS EREM^US. 469 



thin (as compared with Nothrus, Hermamiia, &c.). 

 The femora of the two front pairs have short pedun- 

 cles ; the tibice are often the longest joints, and those 

 of the front pair have a chitinous projection in the 

 median line which carries the tactile hair. The tarsi 

 are tridactyle in all known species ; the claws large 

 and powerful. 



The Abdomen is usually oval, widest not very far 

 from the hind margin, and with just an indication of a 

 median posterior point, which may be absent. The 

 central portion of the notogaster is generally more or 

 less arched, but may be concave (tibialis) ; the marginal 

 part curved upward or downward ; but the two curves 

 may fade into one another so that no sharp line of 

 demarcation can be drawn. The general effect of 

 the creatures in this genus is of having a rather flat 

 abdomen ; the edges of the abdomen are thin. The 

 notogastral plate commences behind the legs to be 

 largely sufflexed on to the ventral surface, and em- 

 braces the ventral to an unusual extent, leaving the 

 portion of the ventral plate which is seen lancet-shaped 

 and pointed posteriorly (PI. XLIV, fig. 3) ; but the 

 sufflexed parts of the dorsal plate do not meet at the 

 median line of the posterior margin ; they leave a small 

 open space there. 



The Genital and Anal Plates are large, the former 

 square, the latter somewhat obloDg. 



The Texture of the notogaster and ventral plates in 

 all known species is rough and dull, either coarsely 

 reticulated, covered with large raised dots, or other- 

 wise rousfhened. 



The Caeca of the ventriculus are very long and large ; 

 sausage-shaped. 



The Ovipositor is long and rather fine. 



The Hairs, both on the notogaster and most of 

 those on the legs, are usually very short, but thick in 

 proportion, very caducent, and often seen with diffi- 

 culty. The lamellar and interlamellar hairs are usually 

 of a similar nature. 



