36 THE CANADIAN ENTOMOLOGIST 



Opening of pygofer oblong, the ventral edge produced into three processes, 

 the middle one broad and bifurcate, the lateral smaller and lanceolate; anal 

 segment large without spines; genital styles straight, fiat, narrow at apical 

 fourth, apex truncate; aedeagus large, produced into a long, curved narrow apex 

 with a curved spine at base of the narrow apex. 



Length 2.6 mm.; tegmen 4 mm. 



Habitat. — Almaguer Cauca, Columbia, 10,500 feet elevation (Lloyd). 

 Pissonotus megalostylus, sp. nov. Figs. 8-a. 



Male, macropterous. Width of head including eyes 1.7 times the length 

 including eyes, antennae reaching nearly to the apex of clypeus, joints subequal 

 in length, vertex longer than wide, apex slightly narrower than base; lateral 

 pronotal carinae straight, diverging posteriorly not quite reaching the hind 

 margin; length of hind tibia subequal to tarsi, first tarsus slightly longer than 

 the other two together, spur large, as long as first tarsus, laminate, small teeth 

 on hind margin. 



Light brown, darker between the carinse of face and clypeus, along the 

 posterior margin of pronotum, over the medio-lateral areas of mesonotum, the 

 abdomen and third tarsus. Tegmina hyaline, median vein and all the apical 

 veins brown, on the median vein all the brown extends into the neighbouring 

 membrane, a brown mark at the end of commissure; wings hyaline with brown 

 veins. 



Opening of pygofer oval, margin entire; anal segment small with two small 

 spines on medio-ventral edge; armature arising from the middle of the dia- 

 phragma as a cultrate projection; genital styles large, flattened, curved, in lateral 

 view bent at right angles before middle, apex pointed the apical portion curled 

 round into nearly a complete circle, a small projection where the curl begins. 



Length 2.5 mm.; tegmen 4 mm. 



Habitat. — Demerara River. British Guiana. 

 Megamelus timehri, sp. nov. Fig. 9. 



Male, macropterous. In structure and colour similar to the macropterous 

 M. notula (Germ.) to which it is closely related. Spur slightly longer than first 

 tarsal joint, thin and broad with apex rounded, numerous small teeth on the 

 hind margin. 



Dark brown, cariuce of head, legs, antennae and pygofer lighter brown; 

 tegmina hyaline, veins brown with a few minute granules bearing black hairs; 

 wings hyaline with light veins. 



Pygofer on the same plan as that of M. notula (Germ.), the ventral margin 

 with three emarginations, a semicircular median one and a pair of lateral ones 

 deeper than wide; anal segment small, closely embraced by the pygofer; genital 

 styles small, flat, outer edge slightly convex, inner edge straight or slightly 

 concave, apex obtusely pointed. 



Length 2.2 mm.; tegmen 3 mm. 



Habitat. — Demerara River, British Guiana. 



M. notula (Germ.) dift'ers from this species in having the two processes 

 between the emarginations on the ventral edge of the pygofer much narrower 

 and pointed, the genital styles are more pointed and have a large projection 

 at base, and the anal segment is not closely embraced by the pygofer. The 

 \ Sir\&ty flavus (Crawford) differs from M. timehri. 



