soim. KEViaiiiS OF THE Mtll.ASUPUSClDDEH. 17 



ANALYTICAL KKY TO THK »PK<IKS OK NKTKOSOMA. 



r«'giiiiiiii |ireH«nt in both Hexen; intiTHpan* UetwfHMi the tii«'HOHt«iriuil loltcB of mule 

 no hrouder than the 1oIk>h thrniHelvcs; hiud tibia«> ri'd on itroxirnul half only. 



1. fiiMifniinit (p. 17). 

 Tt'v'ni ill a absent, at h-iiHt inth^male; inttTHpace ln-twet-n the nieMosternal lult«» of 

 luale Itroadei* thai> the lubvii th«Ui8elvet»; hind tibiae red on dJHtal half only. 



2. HVjrophura {\i. 18). 



I. NETROSOMA FUSIFORMIS. new species. 

 (Plate II, tig. 2.) 



Body fulv'o-lut eons with piceous or cliorolate black lunrkiii^s. Head 

 with tlie ta(;t» and posterior j)art of the ^eiiae fiilvo hiteous, the re^qoii 

 of and about the frontal eosta }j:«Mierally infuseated, the front half of 

 the jrenae below the eyes, a l)roa<l band beliind the eyes, a slender inedio- 

 doisal line reaching; the posterior part of the fasti^jjiuin, and the lateral 

 walls of the frontal eosta above the antennae, black; antennae tuseous, 

 lijihter at base. Upper surface of body behind the hea,' with a median 

 stripe, j^enerally of uniform though in <litlerent individuals of varying 

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

 luteous, 8e[)arating a pair of piceous or chocolate black very broad 

 stripes, whi<h in passing backward broaden on the pronotum and nar- 

 row and ftnally disappear on the abdomen, the nietathoracic episterna 

 fulvous. The nieso- and nietanota an<l some of the basal abdominal 

 segments are sparsely punctate; ])osterior niari'ln of the i)ronotuni fee- 

 bly emarginate, including in theemargination ^ whole dorsal breadth; 

 interspace between the mesosternal lobes of m.de of the same breadth 

 as the lobes them.selves. 'iegmina blackish, the veins occasionally 

 lighter, a little h)nger than the prozona, enlarging slightly beyond the 

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

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

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

 or black, often conHuent along the lower nuirgin 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 niale 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 roundetl 

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

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

 striction, lamellate, as long as the supraanal i>late, the apical i)ortioa 

 suddenly bent slightl}'^ 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 mm.; hind 

 femora, male, d,.^) mm., female. 12.25 mm. 

 Proc. N. M. vol. XX 2 



