266 SPHEGID.?:. 



Genus STIGMUS. 



Stigmus, Juriyie, Ilym. p. 139, pi. iii, gen. 7 (1807). 



Type, S. pendulus, Paiiz. 

 Range. Both hemispheres. 



Head subquadrate, a Httle wider than the thorax ; antennae 



inserted at the base of the clypeus ; labrum 



concealed ; mandibles dentate. Thorax ovate ; 



median segment roundly truncate, longer than 



the mesonotum : \\ ings proportionately large ; 



fore wing Avith the stigma very large and 



conspicuous, one radial and two cubital cells, the 



radial cell acute at apex, the 1st cubital nearly 



twice the length ot" the 2nd, receiving the single 



recurrent nervure beyond the middle ; the 2nd 



^ , cubital cell nearly square : legs simple or very 



Stigmmconqruus, minutely spinose. Abdomen petiolate ; petiole 



2. (. longer than the 2nd segment, the rest of the 



abdomen narrowly ovate, pointed at apex. 



The species of this genus are minute aud easily overlooked. 



S. congruus, Walk., I found hovering about and settling in some 



numbers on a hard bank of earth, underneath a rock, on the higher 



hills in Tenasserim, in April ; but whether the minute holes in the 



bank were tunnels made by them I cannot venture to say. 



Key to the Sjiecies. 



a. Clypeus subtriangiilar, not dentate nor porrect ; 



legs testaceous 'S. congruus, p. 266. 



b. Clypeus transverse, subporrect, projecting at apex, 



with a minute tooth on each side ; legs with 



anterior intermediate tarsi only testaceous .... S. niger, p. 267. 



490. Stigmus congruus, Walk. A. M. N. H. (3) v, 1860, p. 304, $; 

 Mofsch. Bull. Sac. Ivip. Nat. Muse, xxxvi, pt. 2, 1863, p. 23 ; 

 Kohl, Ann. Naturhist. Hufmus. Wien, v, 1890, p. 63. 



5 . Vertex of the head, pronotum, mesonotum anteriorly, 

 scutellum, postscutellum, and abdomen smooth, polished and 

 shining : clypeus subtriangular, slightly convex, surface minutely 

 aciculate, anterior margin widely arched ; front slightly hollowed, 

 with very fine divergent sti-ise, the orbits marked off by a deep 

 furrow consisting of a series of very close punctures ; the posterior 

 margin of the mesonotum with coarse longitudinal and rather 

 deeply marked striae ; median segment coarsely reticulate, with a 

 short deep groove on its posterior slope. Black, the mandibles 

 except at apex, the scape, and basal three joints of the flagellum of 

 the antennae beneath, the nervures and tegulae of the wings, and 

 the legs testaceous ; the tubercles white ; wings hyaline. 



Huh. Sikhim ; Tenasserim ; Ceylon. § . Length 7'5 ; exp. 

 12 mm. 



