466 Mr. CuRTis's Descriptions of 



*120. PsETRASCELis piLiPEs, Gu&. Mag. de Zool. 1834, pi. 102. f. 1. 

 Annales Soc. Ent. vol. v. p. 31 1. pi. 6. 



This remai-kable insect was taken by Lieut. Graves on the coast of Chili. 



*121. MiTRAGENIUS ARANEIFORMIS, Cwr^. 



Niger, thorace subtilissimfe vermiculato prope basin angulato, elytris cinereis 

 cupreo-tinctis subscabris nigro maculatis ; singulis porcis 2 ante apicem 

 coalitis (Tab. XLI. fig. 15.). 



Length from 8^ to 9 lines, breadth 4^ to 5^. 



Dull black : clypeus emarginate ; head minutely punctured and pubescent : antennae longer 

 than the head and thorax, 3rd and five following joints elongated but decreasing, 9th 

 only half as long as the preceding, clavate, 10th obovate, 11th larger, ovate-conic; in 

 the female these three joints are the stoutest : thorax twice as broad as the head near 

 the base, which is slightly bisinuated, elongate-trigonate, deeply concave in front, form- 

 ing acute trigonate angles, the posterior truncated obliquely, and forming a dilated, 

 shghtly reflexed margin ; the entire surface beautifully and exceedingly finely grooved 

 longitudinally, like vermiculated strife, excepting the dilated sides, which are granu- 

 lated ; scutel invisible : elytra the exact width of the thorax at the base, but consider- 

 ably wider at the middle, and thrice as long ; oval, conical behind, convex, covered with 

 an ash-coloured epidermis of a slight coppery tint, with numerous minute black gra- 

 nulations, freckled and marbled also with fuscous spots, largest down the suture and 

 the 2 keeled curved lines ; the 1st of these is down the centre of the elytron, and is 

 united with the 2nd towards the apex, and this is exactly midway between the 1st and 

 the outer margin, which forms a similar keel : underside rather rugose-punctate, with 

 very short pubescence ; sides of antepectus beautifully striated longitudinally, like the 

 back of the thorax : inflected margin convex and similar to the upper surface : legs very 

 long, with ochreous pubescence ; all the thighs densely clothed with longish hairs on 

 the underside and also the tibiae. 



A pair of this handsome insect was taken at Port St. Elena in December. 

 I have never seen any with the thorax so finely striated ; and it is readily 

 distinguished from M. Dejeanii by the 1 st and 2nd elevated lines of the elytra 

 being united at the apex, instead of the 1st and 3rd. In a male given to me 

 by Lieut. Graves, the organ of generation is drawn out as long as the ab- 

 domen. 



