DESCRIPTIONS OF GENERA AND SPECIES. 269 



men rounded posteriorly, instead of having a straight 

 hind margin like that of the female. It has ten pro- 

 jections on each side, the same number as the female ; 

 but they are larger and differently arranged, as there 

 is a greater distance between the first and second; the 

 fact being that what would correspond to the second in 

 the female is rudimentary in the male ; the second in 

 the male corresponding to the third in the female. On 

 the other hand, the projections extend not only along 

 the lateral, but also along the posterior margin ; the 

 two tenth projections coming close together almost in 

 the median line, leaving a deep narrow cut between 

 them. This is partly due to the fact that the posterior 

 spine of each notogastral row is borne, not on the 

 notogaster itself as in the female, but on a large pro- 

 jecting papilla on the hind margin ; which forms the 

 tenth projection of the male, and almost coalesces with 

 the ninth. Bearing these differences in mind, so as 

 not to be confused by the numerical order of the pro- 

 jections (i. e. remembering to count the rudimentary 

 second projection), the forms of these projections, the 

 spines they carry, the marginal bands and arching of 

 the notogaster and the spines upon it, correspond 

 fairly well with the equivalent parts in the female. 

 The penis is in the median line between the insertions 

 of the third and fourth pairs of legs. The anus is 

 situated further forward than that of the female, and 

 is surrounded by a chitinous band. It is protected by 

 two pairs of very large spikes near its posterior margin, 

 the outer pair being the longer. Legs stouter and 

 longer in proportion to the size of the abdomen than 

 those of the female; the tarsal joints, however, are 

 considerably shorter and more conical than those of 

 the female ; the tibiae, particularly of the two hind 

 pairs of legs, and also the genuals of the fourth pair, 

 are very much longer in proportion. There is another 

 singular arrangement in the two hind pairs of legs 

 which is entirely absent in the female. These legs 

 have a decided curve inward ; the genuals and tibiae, 



