10 Mr. MacLeay on some new forms o/'Arachnida. 



segments are in general distinct, the head remains confluent 

 with the thorax. In general the dorsal segments have this 

 disposition to become confluent more strongly than those of 

 the under side ; and thus in the cancriform Epeiridcs we can 

 detect the vestiges of articulation on the under side of the ab- 

 domen, and in Deinopis on the under side of the cephalotho- 

 rax. But what makes the present spider above all others in- 

 teresting is the position of the eyes, which are remarkably un- 

 equal in size. Two of them are dorsal as usual, but the other 

 six have a rather novel situation, not being visible when we 

 look on the back of the insect. The head, being truncated in 

 front, presents, like that of certain saltigrade spiders, or rather 

 like certain Crustacea, a vertical face. Half of this face is oc- 

 cupied by two enormous black eyes, set in blood-red circular 

 rims*, which touch each other laterally, and form irides that 

 give our spider a most truculent aspect. This curious system 

 of eyes may, however, be easily approximated to that of 

 Ctenus, if we make no account of the truncation of the head. 

 I found Deinopis, with the last-mentioned genus and Dolo- 

 medes, under stones in the island of Cuba. It must be as- 

 signed to the Wolfspinnen of Koch, but it is very unlike any 

 of them hitherto known. My drawing was made from it while 

 yet alive. I never found the male. 



Plate II. Fig. 3. Deinopis Lamia, magnified, a, front and vertical view 

 of head ; /3, sternum, mentum, maxillae, and a maxillary palpus. 



Genus MYRMARACHNE. 



Antennce twice as long as head, with the first joint thick, ex- 

 serted, subtrigonal, plane above, and armed beneath and 

 on the inside with six minute spines ; the second joint 

 or fang long, slender, sinuated, and very sharp at the 

 point. 



Eyes eight, disposed as in Attus. 



Maxillce short, straight, dilated and rounded off at their ex- 

 tremity. 



Maxillary palpi having their first joint small ; the second ob- 

 conical, subtrigonal, and thrice as long as the third ; the 

 third, fourth and fifth forming an obconical club, of which 



* This fact proves the affinity of Deinopis to the Lycosina and Saltigrade 

 spiders, where the two largest ocelli of the eight may be seen to have the 

 pupil, as it were, surrounded by a coloured iris as in Vertebrata. 



