II. ACERATA: SOLPUGIDA 





of eleven or twelve somites and contains two pairs of lungs. There are eight 

 eyes two large ones in the middle of the cephalothorax, and three small ones 

 on either side. The species are tropical. Phrynus, simple abdomen; Thely- 

 phonus* (fig. 422), short postabdomen which bears a long, many-jointed thread. 



Order III. Microthelyphonida. 



Small animals only known from Texas, Sicily, Paraguay, and Siam. They 

 have a general resemblance to a scorpion; the chelicene are three-jointed and 

 chelate, the pedipalpi simple; neither these nor any of the legs having chewing 



FIG. 423. Kirnenia whteleri (from Wheeler). 



lamella?. The head is distinct from two 'thoracic segments,' the abdomen is 

 eleven-jointed and is terminated by a long many-jointed caudal flugdlum. 

 Lung sacs, which are true appendages without lung leaves, occur on abdominal 

 segments four to six, and are eversible. The ovary is unpaired, the testes paired. 

 There is a circumoesophageal nerve ring and a single abdominal ganglion. No 

 Malpighian tubes occur. Kirnenia* 



Order IV. Solpugida (Solifugae). 



In these the cephalothorax is broken up into a head bearing the chelirrnr, 

 pedipalpi, and the first pair of legs; and three posterior free somites, each bear- 



