^ Mr. J. Blackwall on new species of 



of two very prominent glossy lobes with a small process between 

 them. Plates of the spiracles reddish brown. 



I dedicate this interesting spider to John Joseph Bennett_, Esq., 

 r.R.S., British Museum^ in acknowledgment of the obligation 

 I am under for his valuable classical assistance in characterizing 

 undescribed species of Araneidea for publication. 



, 5!iiBgT0 Uqin Genus Ergatis, 5/«c/;2^;. , ,••;... ;,..,. 



"'^^'^n"'' 17. Erffutis annuUpes. «iB>,it 



Length of the female ^th of an inch ; length of the cephalo- 

 thorax ^-^ ; breadth gV ; breadth of the abdomen -j^ ; length of 

 an anterior leg -i ; length of a leg of the third pair ^. 



First pair of legs the longest, then the second, third pair the 

 shortest ; these organs and the palpi are pale brown with darker 

 brown annuli. The metatarsus of each posterior leg is provided 

 with a calamistrum. Cephalo-thorax compressed before, with 

 furrows on the sides diverging towards the margins, and a de- 

 pression in the medial line of the posterior region : it is of a dark 

 brown colour, and the anterior part, which is very convex, is 

 provided with several longitudinal lines of white hairs. The 

 four intermediate eyes form a square ; the other four are disposed 

 laterally in pairs, each pair being seated obliquely on a projection 

 of the cephalo-thorax. Mandibles powerful, somewhat conical, 

 vertical, and armed with a few minute teeth on the inner surface : 

 maxillae strong, convex underneath, at the base, with the extre- 

 mities more abruptly curved on the inner than on the outer 

 side, and inclined towards the lip, which is large and somewhat 

 triangular: sternum heart-shaped, thinly covered with white 

 hairs : these parts are dark brown, the sternum being the darkest. 

 Abdomen oviform, thickly covered with short hairs, convex above, 

 projecting over the base of the cephalo-thorax ; along the middle 

 of the upper part a broad, dentated, brownish black band ex- 

 tends, which is generally bisected, or nearly so, by an irregular, 

 transverse, yellowish white line, between which and the spinners 

 is a series of obscure lines of the same hue, forming obtuse an- 

 gles whose vertices arc directed forwards ; a deep border of yel- 

 lowish white encompasses the brownish black band; the sides 

 are brownish black mottled with yellowish white, and the under 

 part is yellowish white, with a brown band in the medial line. 

 Spinners eight, the inferior pair being united to the extremity. 

 Plates of the spiracles brown. 



The male, though smaller than the female, resembles her in 

 colour and in the relative length of its legs ; but the mandibles, 

 which are longer, and curved boldly forwards at the end, have a 

 large prominence on the under side and a minute one in front. 



