J 6 Annals Entomological Society of America [Vol. II, 



in Fig. 1 1 . This hair may be bent anteriorly or erected more than 

 the common hair. Its teeth are directed away from the tip of 

 the limb. Similar hairs, only shorter and with longer teeth are 

 found on all tarsi, about one dozen in number (Fig. lo) . The hair 

 forming the eight rows on the tarsi is of the same structure as 

 that at the distal end of the metatarsus, but also smaller, measur- 

 ing from 0.2-0.28 mm. and with stronger basal spines (Fig. 8) 

 to which two more are sometimes added. The fourth leg in both 

 sexes has besides, as already mentioned, a ninth row of specially 

 structured hairs. They occupy the hypomiddle line and are 

 from thirty to thirty-four in number. They ha\-e hooks on one 

 side and little spines on the other (Fig. 9) and are so arranged 

 that the spines are directed distally towards the tip of the limb. 

 Although each hair measures only 0.12 mm. this row doubtless is 

 homologous with the comb of the Theridiidae, since the position of 

 the row is in each case the same and the structure of the hair, if 

 we disregard its length, \'ery much alike. This brings the family 

 of the Pholcidae, originally regarded as a subfamily of the Theri- 

 didae and later separated from the latter family, into closer rela- 

 tion with it again. Such opinion is further substantiated by the 

 fact that other representatives of the Family Pholcidae show simi- 

 lar conditions. In Spermophora meridionalis the row consists of 

 16 hairs one of which is represented in Fig. 12. In two species of 

 Modisimus from Jamaica I find this row represented by hairs of 

 the type found in the other eight rows, but the distal four hairs 

 show distinct teeth or spines characteristic for the combhair. 

 In Pholcus tipuloides the whole row differs from that of Pholcus 

 phalangoides, resembling more the lower end bristle of this latter 

 species and thus constituting a character in itself sufficient to keep 

 the two species apart. On the other hand neither Hypselistes 

 (Erigone) fiorens, nor any of the five common species of Linyphia 

 examined, show anything of the kind. 



//. On the Musctdar System of the legs. ■ 

 The muscular system of the legs in spiders has been studied 

 several times. The last paper of importance was that by Paul 

 Gaubert in the Annales des Sciences Naturelles, Vol. 13. 1892. 

 Yet neither his studies, nor those of Borner have brought the 

 question to a conclusion. Moreover they contain errors. Thus 

 one of the muscles of the patella was entirely overlooked and 

 another in the tibia wrongly described and in consequence its 

 function misunderstood. 



