320 M. W. R. de V. GRAHAM 



head ; postmarginal vein (Text-fig. 252) rather more distinctly shorter than the 

 marginal. 



It differs from venustus sp. n. in its much shorter not compressed, short-oval gaster 

 with longer hypopygium ; longer propodeum ; wholly citron-yellow antennae, fore 

 coxae, femora, and tegulae ; as well as in some smaller details (compare the respective 

 descriptions). 



Gastrancistrus venustus sp. n. 



(Text-figs. 244, 248, 251) 



$. Body bright green to blue-green, sometimes with slightly golden reflections in places. 

 Mandibles testaceous with reddish teeth. Antennal scape metallic, sometimes narrowly pale 

 at apex ; pedicellus and flagellum testaceous, more or less inf uscate dorsally. Coxae concolorous 

 with the thorax ; legs otherwise citron-yellow with the trochanters partly infuscate, about the 

 basal half of all the femora black with a metallic tinge, fore tarsi brownish, mid and hind tarsi 

 brownish distally with their fifth segment fuscous. Tegulae yellowish to brown. Wings 

 hyaline ; venation yellow or yellowish testaceous, the parastigma and stigmal vein often some- 

 what darker. Length 1-3 to i-8 mm. 



Head about 1-2 times as broad as the mesoscutum ; in dorsal view 2-1 to 2-2 times as broad 

 as long, with temples short, about one sixth length of eyes, and rounded off behind the eyes ; 

 ocelli in a triangle whose base is about 2-2 times its height, POL about i-6 times OOL. Head 

 in front view about 1-25 times as broad as high. Eyes separated by about 1-35 times their 

 own length. Malar space somewhat more than one third the length of an eye. Breadth of 

 oral fossa about 2-5 times the malar space. Clypeus nearly three times as broad as long, its 

 anterior margin evenly and fairly strongly curved. Mandibles rather small, not falcate, their 

 lower margin hardly sinuate ; teeth acute, the outer one long, the others decreasing slightly in 

 size. Head with fine engraved sculpture, moderately shiny with the vertex slightly duller ; 

 scrobes smooth and polished. Antenna (Text-fig. 244) with scape not nearly reaching the median 

 ocellus, its length only about equal to the transverse diameter of an eye, about four times as 

 long as broad ; combined length of pedicellus and flagellum somewhat less than breadth of 

 head ; pedicellus, in profile, about 1-7 times as long as broad, nearly twice as long as the first 

 funicular segment ; funicle proximally about as stout as the pedicellus, thickening distad ; 

 its first segment quadrate or very slightly transverse, the following segments slightly transverse, 

 the fifth about 1-5 times as broad as long ; clava only 1-5 to i-8 times as long as broad, but 

 somewhat longer than the three preceding funicular segments together ; sensilla not numerous. 



Thorax hardly 1-5 times as long as broad. Mesoscutum about i-8 times as broad as long, 

 moderately shiny, with very fine engraved sculpture ; mid lobe with numerous hairs ; notauli 

 deep, slightly bisinuate. Scutellum slightly longer than the mesoscutum, distinctly longer 

 than broad, sculptured like the mesoscutum though rather more delicately with three to four 

 pairs of bristles ; frenum weakly marked off by a superficial line ; scutello-axillar sutures 

 converging only moderately and meeting the mesoscutum only slightly mesad of the hind 

 ends of the notauli. Axillae sculptured like the scutellum. Dorsellum about half as long as 

 the frenum, polished and nearly smooth. Propodeum medially hardly more than one fifth the 

 length of the scutellum, shiny and weakly alutaceous ; median carina fine ; plicae absent ; 

 spiracles subcircular, separated by nearly half their diameter from the metanotum ; callus 

 with several hairs, but these do not extend as far as the metapleuron. Metapleuron shiny, 

 weakly alutaceous ; mesepisternum delicately alutaceous below, but with an upper subtrian- 

 gular area which is nearly smooth ; mesepimeron distinctly marked off, about three times as 

 long as broad, nearly smooth ; mesosternum polished and nearly smooth, mesolcus fine but 

 distinctly impressed ; postspiracular sclerite with moderately fine reticulation which is slightly 

 raised above the surface. Legs rather short, the femora stout ; hind coxae about 1 -8 times as 

 long as broad, with moderately fine alutaceous sculpture which is hardly raised above the 



