199 



Pseitdochirldinm n. gen. 



1889. CheUfer 111. T. Thoreil pars. (10.) p. 591. 

 Céphalothorax (listiiictly produced towards the front margin. Eyes are wanting. 

 Only ten abdominal tergites visible from above. The co.vae of the fourth pair of legs 

 are much broader tlian long, being produced into a posterior plate, which covers the 

 base of the abdomen together with the genital area. The articulation between the 

 trochantin and the femur proper of the fust pcdr of legs with the articulate-heads of 

 both anterior and posterior sides in the middle; the articulate membrane of tlie tro- 

 chantin of the fourth pair of legs is almost perpendicular on longitudinal axis; the 

 tarsi are distinctly longer than the tibia. 



I. Characteristic of Genus. 



The head is distinctly produced in front and neither eyes nor ocular spots 

 are present, hut two very prominent transverse grooves. The abdomen has the 

 sclerites of from the second to the ninth tergites divided by a distinct longitudinal 

 line into two halves, which establish an obtuse angle with each other, open towards 

 the front; the tenth tergite is only partly visible from above and the eleventh not 

 at all ; the tergites possess a single transverse row of distinctly clavate hairs, but 

 none in front of the row. The aniennae have a flagellum, which consists of two 

 more or less dentated hairs, a lamina interior, which is provided with three den- 

 tated lobes and a serrated terminal spine, and a serrula exterior, which has long 

 teeth of almost equal length, but the basal one, which is enlarged towards the 

 extremity, and the terminal partly free and pointed one; their galea consists of 

 two divisions, of which the one is unbranched and the other provided with at 

 least three terminal branches (PI. IV, figs. 12 b-c). The palps are short and clumsy. 

 The co.rae of the fourth pair are of a most remarkable shape (PI. IV, fig. 12 d), being 

 much broader than long, because the posterior surface of the coxa proper is pro- 

 longed backwards into a plate, broader than the anterior part of the coxa and 

 covering the base of the abdomen together with the genital area; this plate has 

 its margin behind the articulate cavity prettily rounded, and its ventral surface is 

 granular and provided with pointed hairs, while its dorsal is smooth without hairs; 

 a sexual difference is according to Thorell (10. p. 593) found in the structure of 

 these coxae, for in the female they are as described, while they in the male are 

 "magnae et sub-triangulae spatium triangulum magnum inter se relinquunt"; the 

 egg-bundle, which the female carries attached to the base of the abdomen, is partly 

 covered by the coxal plate. The legs are remarkable in several respects; the tro- 

 chantin of the first pair of legs is connected with the femur proper by a slightly 

 developed hinge-joint; the two condyli are placed in the middle, and the anterior 

 and posterior are almost opposite to each other; the articulate membrane is very 

 narrow and the mobility is only limited (cf. p. 37; pi. I^^ figs. 12 e-f ; figs. 6 a-b). 

 The articulation between the trochantin and the femur proper of the fourth pair 

 of legs is almost perpendicular on the longitudinal axis of the joint, and its mem- 



