NO. 1124. EE VISION OF THE MELANOPLISCUDDER. 17 



ANALYTICAL KEY TO THE SPECIES OF NETROSOMA. 



Tegmiua present in both sexes; interspace between the mesosternal lobes of male 

 no broader than the lobes themselves; hind tibiae red on proximal half only. 



1. fusiformix (p. 17). 



Te^mina absent, at least in the male; interspace between the mesosternal lobes of 

 male broader than the lobes themselves; hind tibiae red on distal half only. 



2. nigropleura (p. 18). 



i. NETROSOMA FUSIFORMIS, new species. 

 (Plate II, fig. 2.) 



Body fulvo-luteous with piceous or chocolate black markings. Head 

 with the face and posterior part of the genae fulvo-luteous, the region 

 of and about the frontal costa generally infuscated, the front half of 

 the genae below the eyes, a broad band behind the eyes, a slender inedio- 

 dorsal line reaching the posterior part of the fastigiuin, and the lateral 

 walls of the frontal costa above the antennae, black ; antennae fuscous, 

 lighter at base. Upper surface of body behind the head with a median 

 stripe, generally of uniform though in different individuals of varying 

 breadth, generally as broad as the interspace between the eyes, of fulvo- 

 luteous, separating a pair of piceous or chocolate black very broad 

 stripes, which in passing backward broaden on the pronotuin and nar- 

 row and finally disappear on the abdomen, the metathoracic episterna 

 fulvous. The uieso- and metanota and some of the basal abdominal 

 segments are sparsely punctate; posterior margin of the pronotum fee- 

 bly emarginate, including in the emargination the whole dorsal breadth; 

 interspace between the mesosterual lobes of male of the same breadth 

 as the lobes themselves. Tegmiua blackish, the veins occasionally 

 lighter, a little longer than the prozona, enlarging slightly beyond the 

 base in the male. Fore and middle femora fuscous; hind femora with 

 the outer face luteo fulvous or pallid luteous, crossed with a variable 

 obliquity by a pair of broad subtransverse bands of ferrugineo-fuscous 

 or black, often confluent along the lower margin and with a basal spot 

 of the same, the bands repeated on the inner side; upper face and genic- 

 ulation ferruginous; hind tibiae glauco-plumbeous on the distal, coral- 

 line on the proximal half, the transition gradual, the spines pallid 

 with black tips. Supraanal plate of male long triangular with gently 

 convex sides, the tip acutangulate, with a rather deep median sulcus 

 interrupted in the middle, bounded at base by high and coarse rounded 

 walls, at tip by slight walls; furcula wholly wanting; cerci moderately 

 broad, equal from the base or with the slightest possible median con- 

 striction, lamellate, as long as the supraanal plate, the apical portion 

 suddenly bent slightly inward, turned strongly downward and sharply 

 acuminate. 



Length of body, male, 14 mm., female, 21.5 mm.; antennae, male, 7 

 mm., female, 8 mm.; tegmina, male, 3 mm., female, 3.25 inin.j hind 

 femora, male, 8.5 mm., female, 12.25 niin. 

 Proc. N. M. vol. xx 2 



