66 



according to liis o[)iiiion the funclioii of I'leaning Ihe rlaws; similar hairs were 

 later on described by Daday (1897. 14. p. 479) in C. Wlassicsi Dad., and they are 

 also found in C. Raiji L. K. and C. terribilis n. sp. (PI. I, lig. 1 h); with regard lo 

 the delails I refer to p. 68. The legs are especially remarkable on account of the 

 marked dilTerence, which is found between the anterior and posterior hvo ])air 

 of legs; these are strong and powerful!, those weak and slender. The lirst pair of 

 legs is remarkable by its rather shorl, bul slender and tibia-shaped til)ial pari of 

 Ihe femur, and slender, undivided larsus, which is longer than the basal portion 

 of the femur (PI. I, lig. 1 1). The fourth pair is provided with a trochantin of a 

 peculiar shape; it is about half as long as the whole femur and ends with an 

 articulate cavity, which faces forwards and outwards; if we follow the articulate 

 membrane between the two joints, it will be seen to be curved towards the base 

 in the middle anteriorly, but away I'rom it posteriorly (PI. I, fig. 1 m,/'). The tarsus 

 of the fourth pair of legs is distinctly longer than the tibia and divided into two 

 joints, of which the basal is much shorter than the terminal. The claws are 

 long and slender, and so is the arolium , which has a moderately enlarged 

 sucking-cup. Near the base of the lirst tarsus a long, slender "tactile" hair is 

 placed dorsally (PI. I, fig. 1 m). 



As far as we are able to judge from the available material, it seems to be 

 pretty certain, that the Chthoniinae Dad. bear greater similarity to the Obisiinae 

 Steck, than lo the Pseiidobisiinae Hans, especially in the structure of the antennae; 

 but if this similarity is more than a superficial one, the time will show. The 

 Chthoniinae Dad. seem lo have at least one character of no mean value in common 

 with the Psendobisiinae Hans., namely the i)resence of tactile hairs on the dorsal 

 surface of the hand of the palps (cf. Balzan 12. p. 503). 



II. Genera, 



The genera of this subfamily are not very well founded; I am now going to 

 set forth their characteristics one after the other and express my doubts about 

 their systematic value. The genus Heterolophus Tom. is established on account of 

 a median concavity in the front margin; but as Daday has reexamined Tömesvary's 

 original specimens and found , that the front margin has no inwards median 

 curvature and is serrated as in most species of Chthonins L. K. (cf. 11. p. 190), this 

 genus must as he proposed go out. Stecker's genus Megathis Steck. (4. p. 521) is 

 described as a Chlhonins CK. with large granules, at least in M. desiderata Sleek.; 

 but as this author's statements are most often ver}' incorrect or too chimeric to 

 be trusted, we can not accept his remarkable genus without further examination 

 (cf. p. 65). Lechytia Balz. (12. p. 499) is nearly related to Chtlionius C. K., but has 

 a flagellum, consisting of a few hairs, placed in a row; this modification in the 

 structure of the flagellum is indeed interesting, but time will show, if it is sufficient 

 to warrant the establishment of a new genus. Balzan subdivides (12. p. 546) Chtho- 

 nins C. K. into three subgenera: PseudoclUhuniiis Balz, with Iwo eves, Clithonius Balz. 



