204 Mr. F. Walker on some new species of Chalcidites 



XXI. — Notes on Chalcidites, and Descriptions of various new 

 species. By Francis Walker, F.L.S. 



Isosoma Maderse, fern. JEneo-atrum, capite fulvo biniaculato, an- 

 tennis pedibusque nigris, genubus tarsisque fulvis, alls subflavis. 



Body black, convex, with a scarcely perceptible bronze tint, spa- 

 ringly clothed with hairs : head and chest punctured : head transverse, 

 subquadrate, somewhat rounded in front, shining, very finely punc- 

 tured, having two very indistinct tawny spots behind, a little broader 

 than the chest : eyes dark red : feelers black, somewhat slender, rather 

 more than half the length of the body ; their breadth increases but 

 very slightly from the base to the tips ; first joint long, bright 

 tawny, slightly spindle-shaped; second long-obconical, piceous, 

 tawny at the tip ; third a little longer than the second ; fourth shorter 

 than the third ; fifth shorter than the fourth ; the two following 

 joints also successively decreasing in length ; club spindle-shaped, 

 very little broader but more than twice the length of the seventh 

 joint: chest nearly spindle-shaped, broader in front : fore-chsst sub> 

 quadrate, shining, very finely punctured, a little broader than long, 

 well developed ; fore-angles tawny and somewhat rounded : shield of 

 the mid-chest shining, very finely and sparingly punctured, almost 

 narrower than the fore-chest ; sutures of the parapsides very strongly 

 marked, converging till they reach the hind-border of the shield, 

 where their distance from each other is a little less than one-third of 

 its breadth ; axillse large, and nearly conniving on the back, being 

 separated there from each other by less than one-sixth of the breadth 

 of the chest ; scutcheon conical, rather more thickly punctured than 

 the fore-part of the body ; it has a rim along its hind-border which 

 joins the hind-scutcheon; the latter is very short : hind-chest well 

 developed, declining, obconical, rugulose : petiole short, rugulose, 

 nearly cylindrical, not half the length of the hind-chest : abdo- 

 men long- elliptical, smooth, shining, clothed with a few white hairs, 

 compressed at the tip, a little shorter but hardly broader than the 

 chest ; metapodeon occupying about one-fourth of the back ; octoon 

 not half the length of the metapodeon ; ennaton a little shorter than 

 the octoon ; decaton a little longer than the ennaton ; each of the 

 three following segments equalling the decaton in length : legs 

 black ; knees, feet, and tips of thighs, of hips and of shanks tawny ; 

 tips of four hinder feet piceous : wings with a slight yellow tinge ; 

 veins luteous ; ulna much less than half the length of the humerus ; 

 radius shorter than the ulna ; cubitus shorter than the radius ; brand 

 very small. Length of the body 1^ line ; of the wings 'l^ lines. 



This and the twelve following species were found in the island of 

 Madeira by Mr. Wollaston, to whose kindness I am indebted for the 

 opportunity of examining them. 



Isosoma minor. 



Dicyclus Amage, mas. Viridi-ccneus , abdomine purpurea, antennis 

 nigris, pedibus piceo-fulvis, femoribus aneis, alis limpidis. 



Head and chest convex, bronze, finely shagreened ; head large. 



