208 MR. R. I. PococK ON NEW [Mar. 5, 



^furthermore, the posterior end of the abdomen is abruptly and 

 obliquely truncate, the truncated area being perfectly circular, 

 nearly flat, and separated from the rest of the abdomen by a rounded 

 or somewhat sharply defined edge. From this edge to the centre 

 of the disk radiate a number of grooves, corresponding to and con- 

 tinuous with those of the rest of the integument. In the lower 

 half of the disk there are three pairs of conspicuous sigilla, which 

 decrease in size from above do\vnM'ards and indicate the presence 

 of powerful dorso-ventral muscles, which have apparently migrated 

 backwards from the fore part of the abdomen ; the edge of the disk 

 is festooned, each festoon being tufted with hairs, which form a 

 continuous rim or crown round the disk. Lastly, the spinners 

 and the anal tubercle lie in a depression on the underside of the 

 abdomen. 



In other respects these Spiders closely resemble the normal 

 Ctenizidce, and Simon classified them with the genus PacJiylomerus 

 on the strength of the presence of a depression on the upperside 

 of the tibia of the 3rd leg. This depression, however, cannot be 

 regarded as a certain sign of affinity between genera of this 

 family, since it is also developed in Heligmomems, one of the 

 Idiopinae, and in Myrtale and Tliyropoeus, which belong to the 

 Miginse. In the present instance it no doubt misled Simon into 

 associating with PacJiylomerus two genera which are probably not 

 more neai-ly related to the latter than they are to Bothriocyrtum, 

 or any other genus of the section Ctenizeae, though no doubt they 

 are a specialized offshoot from the latter. Since, however, the 

 specialization has been carried to such an extreme and is shared 

 by three well-marked genera, the latter, in the absence of inter- 

 mediate types connecting them with the typical Ctenizidae, may be 

 regarded as constituting a special subfamily, which I propose to 

 call Halonoproctinse, from the new genus Halonoproctus. 



Halonoproctus, gen. nov. 

 {aXwv, a disk, and Trpwfcros, hind- quarters.) 



Carapace smooth : cephalic area high ; fovea deep, strongly 

 procurved ; ocular area I'emote from the anterior margin ; the 

 clypeus about as long as the ocular area, the latter three times as 

 wide as long. Eyes of anterior line almost straight, subequal, the 

 laterals a little in advance of the medians ; the medians less than a 

 diameter apart and rather more than a diameter from the laterals ; 

 but space between median and lateral on each side not twice as 

 great as that between the medians ; eyes of posterior line almost 

 straight, the medians less than two diameters of the anterior 

 medians from the latter ; the two laterals on each side about a 

 diameter apart. 



Rastellum consisting of a conical process studded with spiniform 

 teeth. Labium armed with a few (8) teeth. Mcuvilla studded 

 throughout its length with spiniform teeth. Sternum as broad as 

 long ; marked with the normal three pairs of sigilla, those of the 



