]\Ir. A. G. Butler on the Agaristidae. 135 



upper surface is beset with minute rough tubercles. No distinct 

 t'yes are present ; at the base of the peduncle of the inner an- 

 teniue, on each side, one perceives simply a small roundish 

 black speck as the indication of an organ of vision. The 

 ])edunclcs of the antcnnaj are tolerably hairy, the internal 

 s])ine of the peduncle of the inner antenna} longer than the 

 j)eduncle itself. The anterior legs are very long, and when 

 laid backwards reach beyond the caudal swimmeret : their 

 several joints much compressed, the brachlum 7*o, the ante- 

 brachium 3"5, the carpus 4, the dactyli 5 lines long ; the 

 brachium and antebrachium beset with one or two small spines 

 on their outer margins ; the hand is likewise provided on its 

 upper and lower margins with some very fine teeth. The 

 succeeding pairs of legs a])pear considerably shorter ; the hand, 

 particularly of the third and fourth pairs of legs, almost pris- 

 matic, quadrangular ; the finger slender, sliglitly hairy ; the 

 terminal joint of the fifth pair much shorter than the conical 

 tarsus ; the coxa provided on its inner side with two roundish 

 projecting scales, behind which lie the orifices of the male 

 genital organs. The first abdominal segment is flat on its 

 upper sm-face, the four succeeding furnished with a well- 

 marked salient sharp median ridge, which is prolonged at the 

 end of each segment into an acute anteriorly hamate and 

 incui-ved spine ; this spine is most highly developed on the 

 fourth segment. The median ridge is but little indicated on 

 the sixth segment, and bifurcates anteriorly. The pointed 

 triangular median plate of the caudal swimmeret roughly 

 granulated at the base, provided Avith two ridges converging 

 towards the tip on the hinder half. The plates of the swim- 

 meret are all strongly ciliated on their margins. Length of 

 the body 2 inches. 



A single male specimen of this interesting species, found in 

 the MediteiTanean near Sicily, exists in the Zoological Museum 

 at Vienna. 



XVIII. — Notes on certain G^eweraofAgaristidge, with Descrip- 

 tions of new Species. By Arthur Gardiner Butler, 

 F.L.S., F.Z.S., &c. 



[Plate Xni.] 



The following notes I have made dm-ing my rearrangement 

 of the Agaristidffi in the collection of the British Museum. 



The genera Hespcuiarista and Damias (part.), placed by Mr. 

 Walker among the Castnii, are referable to the present family, 



