204 G. E. J. NIXON 



and cutting off between itself and the disc a narrow, parallel-sided furrow. Seen from above, the 

 metapleurum bulges markedly. Hind coxa very large ; inner spur of the hind tibia fully half as 

 long as the hind basitarsus. Vannal lobe small and beyond its widest part not concave but 

 without a fringe of hairs ; areolet very small ; ist abscissa of the discoideus as long as the 2nd ; 

 nervellus of the hind wing straight and directed inwards on the vannal lobe side. Tergite i very 

 strongly narrowed behind, wedge-shaped (Text-fig. 244). Tergite 2 with two lateral sulci that 

 run close to the lateral margin of the segment and enclose a subtriangular area that is considerably 

 longer than wide at apex. 



Related to Promicrogaster Brues and Richardson (known to me only from P. munda 

 Muesebeck and P. polyporicola Muesebeck) but differing from this genus in having 

 the propodeum smooth, polished and the median field of tergite 2 quite different in 

 shape. 



It is difficult to estimate the generic value of Promicrogaster and Sendaphne on the 

 species available for examination and it may become necessary later to reduce them 

 both to the status of species-groups within Hypomicrogaster . 



The labium of Sendaphne is more lengthened and the galea considerably longer than 

 in any species of Promicrogaster known to me. 



Key to Species 



Females 



A Head bright reddish-yellow like the thorax ; tergites 4-6 banded with dark brown ; 

 median field of tergite 2 wider, embracing nearly the entire surface of the segment ; 

 gaster less compressed laterally ; larger, ca. 5 mm. without ovipositor ; ocelli in a 

 lower triangle .......... olearus sp. n. 



Brazil: Nova Teutonia, 2.^.1937, 1 $, the TYPE, (Plaumann) . Type in the 

 British Museum (Nat. Hist.). 



B Head blackish ; tergites 4-6 reddish-yellow like the rest of the gaster ; median field of 

 tergite 2 narrower, occupying a smaller area of the entire surface of the tergite (Text- 

 fig. 244) ; gaster very strongly compressed laterally ; smaller, ca. 4 mm. without 

 ovipositor ; ocelli in a higher triangle ...... sulmo sp. n. 



Mexico: Teapa, Tabasco, i, 1 $, the TYPE, (Godman-Salvin Coll.). Type in the 

 British Museum (Nat. Hist.). 



LARISSIMUS gen. n. 



Type-species : Larissimus cassander sp.n. 



o*$- Size large: 8 mm. Entire body highly polished. Labial palpus 3-segmented. Scape 

 rather short. Ocelli in a low triangle, the posterior, transverse tangent to the anterior ocellus 

 cutting the other pair. Side of pronotum without trace of a dorsal furrow. Lateral, polished 

 zone of the scutellum only very weakly convex in the forwards direction. Propodeum with 

 strong medial keel. First abscissa of the radius very long, twice as long as the ist transverse 

 cubitus and very obliquely placed on the stigma ; areolet fairly large, the 2nd transverse cubitus 

 received onto the extreme base of the 2nd abscissa of the radius (Text-fig. 340). Claws simple. 

 Tergite 1 about two and a half times longer than wide (in apical third). Hypopygium evenly 

 sclerotized but sharply folded towards apex. Ovipositor very short, its sheaths about as long as 

 the 2nd segment of the hind tarsus. 



In general structure of body, the genus reminds of Protomicroplitis and Parenion. 



