1891.] ASSOCIATION OF GAMASIDS WITH ANTS. 647 



organ is often drawn as the lingua and occasionally, I fear, as the 

 epistome, whence great confusion arises ; it would bear almost the 

 same relative position to the epistome as in the two fig:ures if seen 

 from below, but the epistome would not advance so far beyond it. 



Ventral surface rough, deeply excavated for the reception of the 

 legs, and with numerous strong ridges. There is a singular round 

 chitinous projection, surrounded with a strong rough edge, in the 

 median line between the coxse of the 4th pair of legs in both sexes, 

 with a deep pit on each side of it. Genital plate of female straight 

 behind, rounded anteriorly, extending from a little in front of the 

 4th coxae nearly to those of the first pair. That of the male of the 

 ordinary form and position. All the legs furnished with claws and 

 caruncles. 



Hah. Very numerous in one nest of the wood-boring Ant 

 Camponotus herculeanus (probably race lignipenlus) near Innsbruck, 

 Tyrol, and a few in other nests of the same Ant in the same place. 

 Mr. E. Bostock has since found it fairly abundant in the nests of 

 Formica fusca at Buxton, Derbyshire. 



L^LAPS cuNEiFER, u. sp.^ (Plate XLIX. figs. 2-2y!) 



2 J 



millim. miUim. 



Length, about '77 '64 



Greatest breadth, about . . -60 -47 



Colour dull yellow-brown or bay, the specimens vary in depth of 

 tint from lijjht to quite dark. 



Texture fully chitinized, smooth but not polished ; the whole 

 body covered with irregular reticulations averaging about 25 to 50 

 to the millimetre, caused by fine raised chitinous ridges. No other 

 markings. 



Shape pyriform, very slightly truncated in front, I'ounded pos- 

 teriorly. The whole body much arched on the dorsal surface. 



Mandibles of male (fig. 2 b) with the fixed arm of the chela 

 having a bifid or bidentate end, but not otherwise dentate. Mov- 

 able arm strongly recurved at the distal end, and with a long, 

 chitinous, curved, accessory piece projecting beyond the principal 

 part of the chela. Epistome (fig. 2 c) hyaline, almost rounded, but 

 with a slight tendency to a median point, the whole anterior edge 

 set with sharp points, of which one on each side is somewhat longer 

 than the others. The whole dorsal surface set with short, cuneiform, 

 slightly curved hairs (fig. 2/) at almost equal distances, about 10 

 to 15 to the millimetre; these also surround the periphery. 



Ventral surface of the female (fig. 2 a) with anal plate small and 

 spade-shaped ; genital plate large, with a semitransparent, rounded, 

 anterior edge overlapping the sternal plate. Peritreme conspicuous, 

 almost straight. The plates on the ventral surface are composed of 



^ According to Professor Berlese's latest classification, although not ac- 

 cording to his former ones, this species and the others of the same genus in this 

 paper would probably be considered as belonging to the genus " Sejus." I have 

 not thought it wise to adopt this view. 



