58 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, 1 10 



usual anterior coxal processes, such as those typical of the Mygalo- 

 morphae (fig. i8 C, F, cxp). 



The labrum of the dipneumone spiders is a supraoral lobe of 



Fig. 20. — Araneida-Dipneumonomorphae. 



A, Heteropoda venatoria L., Sparassidae, prosoma, with chelicerae, pedipalps, 

 and bases of legs, ventral. B, Metargiope trijasciata (Forsk.), Argiopidae, 

 female, anterior end of body. C, same, mouth region and pedipalps, anterior, 

 showing preoral cavity (PrC) enclosed by labrum, coxal processes of pedipalps, 

 and pedipalp sternum. D, Heteropoda venatoria L., epistome, labrum, and bases 

 of pedipalps, anterior. E, Metargiope trijasciata (Forsk.), cheliceral fang and 

 muscles. F, Latrodectus mactans Fab., Theridiidae, female, chelicerae with 

 poison glands and ducts. G, Dysdera crocata C. Koch, female, Dysderidae, 

 anterior part of ventral surface of body, with bases of pedipalps and first legs, 

 showing large coxal processes embracing the suboral pedipalp sternum. 



variable form and size (fig. 20 C, D ; fig. 21 B, Lm) suspended from 

 the epistome (fig. 20 D, Epst), which is united laterally with the 

 pedipalp coxae (Cr). Between the labrum and the under lip formed 



