Australian Hymenoptera: Proctotrypoi dea. 



NO. 4. 



By Alan P. Dodd. 

 [Read May 11, 1916.] 



Family PLATYGASTERIDAE. 



Dolichotrypes, Crawford and Bradley. 



A peculiar genus, formerly containing only the type 

 species, D. hopkinsi, Craw, and Brad., from North. America. 



Dolichotrypes idarniformis, n. sp. 

 9 . Coal-black ; coxae concolorous, the legs reddish- 

 yellow, the femora and apical half of posterior tibiae dusky ; 

 antennal scape red, suffused dusky at apex, the pedicel and 

 funicle joints a little suffused with red. Head transverse; 

 with fine, dense, raised, polygonal reticulation : eyes large, 

 bare ; ocelli rather wide apart, the lateral ones somewhat 

 nearer to the eye margins than to the median ocellus. 

 Thorax convex dorsad ; the pronotum and mesonotum with 

 sculpture similar to that of the head ; scutum long, distinctly 

 longer than greatest width, the parapsidal furrows delicate, 

 approaching each other caudad, not quite attaining anterior 

 margin : scutellum convex, with a short blunt tubercle or 

 projection caudad, with silvery pubescence. Abdomen 

 composed of five visible segments : segments 4-6 forming a 

 long linear stylus, longer than rest of body, the sixth some- 

 what longer than fifth, which is longer than the fourth ; second 

 (first body) segment and third convex above and below, stout; 

 second smooth and shining, about one-third longer than wide, 

 the third transverse, 3-6 with fine surface sculpture. Legs 

 slender : tarsi 5-jointed : proximal joint of posterior tarsi 

 almost as long. as other four united. Forewings long, broad, 

 the apical margin broadly rounded : hyaline ; marginal cilia 

 absent, the discal cilia practically so ; wholly without venation. 

 Antennae 10-jointed ; scape long and slender : pedicel longer 

 and a little wider than funicle joints, over twice as" long as 

 wide; first funidle joint small, one-half longer than wide; 

 second distinctly longer : third shorter than second, as long 

 or slightly longer than first : fourth slightly longer than wide ; 

 club abrupt, 4-jointed, the joints fully as long as wide, the 

 first very slightly the longest. Length, to apex of stylus, 

 275 mm.: to base of stylus, 1*20 mm. 



