374 PERCY SLADEN TRUST EXPEDITION 



two broad short teeth on the middle of the apical margin, clothed with short close silver 

 pubescence. Head large and massive, much broader than the thorax, opaque, with a 

 shining furrow on the inner margin of each eye near the summit; antennae inserted 

 nearer to the eyes than to each other, the second joint of the flagellum a little longer than 

 the third and half as long again as the first. Posterior ocelli as far from each other as 

 from the eyes and fully half as far again from the posterior margin of the head as from 

 each other ; eyes separated at the base of the clypeus by a distance equal to about one- 

 third of the length of the scape, the facets in front much larger than elsewhere. Thorax 

 opaque, the scutellum slightly shining ; pronotum transverse, rounded at the angles, with 

 a deep groove in the middle ; mesonotum broadly and shallowly depressed in the middle 

 anteriorly, with short longitudinal stria? on the middle of the apical margin ; scutellum 

 almost smooth, with a few scattered punctures ; median segment with a deep sulcus from 

 base to apex, obliquely striated at the base. Mesopleurse opaque, with a vertical sulcus 

 below the anterior wings, moderately hollowed for both the anterior and intermediate 

 femora. Abdomen petiolate ; the first segment a little longer than the mesonotum and 

 scutellum combined, gradually and evenly broadened from the base, about half as wide 

 at the apex as long ; apical segment pointed, very narrow. Posterior tibiae spinose, 

 intermediate almost smooth. The recurrent nervure is received beyond two-thirds from 

 the base of the cubital cell. 



Black ; the mandibles, except at the apex, clypeus and four basal joints of the 

 flagellum dull ferruginous brown ; scape, pronotum, tegulae, pro- and mesopleuree, a large 

 spot on the posterior margin of the mesonotum, a line above the tegulse, scutellum, 

 postscutellum, a large triangular mark at the base of the median segment, the apex of the 

 median segment extending onto the sides, a very small obscure spot on each side of the 

 first abdominal segment near the apex and the legs reddish chrome. Wings hyaline, 

 nervures black. 



Length 9 mm. 



$. The first abdominal segment is much narrower than in the female, very little 

 broadened to the apex, and is longer. The median segment is wholly black. 



Localities. Seychelles: Silhouette, Mare aux Cochons, over 1000ft. (September): 

 Mahe\ Cascade Estate (February). 3 ?, 1 $. 



The colour of the markings is reddish chrome (Roy. Horticultural Soc. Colour Chart 

 51, shade 4). Mr Scott informs me that the colour is natural and not changed by 

 cyanide. 



