57 



side it becomes gradually wider to beyond the middle, then roundly 

 narrowed to the apex, a line on the depression at the base of the seute- 

 llum in the middle, a line in the centre of the latter, which becomes 

 gradually wider to the rounded apex, a line in the centre of the basal 

 mesopleural suture, a large broader one in the central, the apex of the 

 hind coxae, their trochanters, a streak in the centre of the hind femora, 

 the femoral teeth and the hinder side of the hind tibiae, black; there is a 

 large brown mark on the femora at. the base and apex of the femoral 

 teeth. Flagellum of antennae brown, black above, the scape yellow. 

 Wings hyaline, the nervures black. Female. Length 5 mm. Chinandega, 

 Nicaragua. 



Head shining, above covered with black hair. Mesonotum and scu- 

 tellum strongly closely punctured; the apex of the scutellum depressed 

 behind the keel, marked sparcely with short keels. Metanotum with two 

 regular rows of area, the basal areae broader compared with their length 

 than the apical; the apical slope smooth. Abdominal petiole three times 

 longer than wide, about one third of the length of the hind coxae which 

 are more dilated, broader compared with their length, than usual; they 

 are about half the length of the hind coxae. The third to sixth dorsal 

 segments of the abdomen on the sides bear interrupted black bands, 

 these becoming gradually smaller. Pleurae strongly, but not closely punc- 

 tured, the mesopleurae end in a sharp point in the centre, the base and 

 apex, from this, have oblique slopes. 



Platychalcis gen. nov. 



Mesonotum and scutellum flat, on one level; the apex of scutellum 

 rounded, bordered l^y a row of large foveae, the base separated from the 

 mesonotum by a transverse furrow. Metanotum shorter than the scute- 

 llum, with an oblique slope; in its centre is a stout keel which bifurcates 

 shortly beyond the middle. Antennae stout, 13-jointed. Abdomen with a 

 petiole fully four times longer than wide. Four front femora narrowed 

 on the basal half; the hinder greatly thickened, with at least eight small 

 blunt teeth. 



The second abdominal segment is as long as the petiole and about 

 half the length of the following segments united. Antennal scape stout, 

 not reaching to the ocelli. Occiput transverse, temples very short, almost 

 obsolete, the eyes reaching very far back. Ocelli large, placed in a curve 

 on the outer edge of the vertex. Eyes large, slightly converging above. 

 Front very little hollowed. The head has not an oblique slope from the 

 vertex to the antennae, being formed more as in Chalcis. Parapsidal fu- 

 rrows, narrow, shallow. 



In Ashmead's arrangement this genus would come in near Halticella- 

 cf. Mem. Carnegie Museum, 25.5. 



1425 Platychalcis flavicollis sp. nov. 



Black, shining, the inner eye orbits to near the top, the hinder part 

 of the pronotum broadly, two triangular marks on the scutellum, the 

 narrow end at the base, yellow; legs yellow, all the coxae black, the 



