128 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



Hagenius brevistylus Selys 



Bulletin de rAcademie royale . . . de Belgique, 21: 82: 1854. 



Nymph (PI. iii, Fig. 8). — Color uniform dark brown or black. 



Head : front declivous and with the flattened segments of the 

 antennae forming a sort of shovel ; labium with mentum as broad 

 as long ; eyes with a sharp angle on the dorsum of the head ; 

 caudo-lateral margins of the head with a flattened, dorsally pro- 

 jecting tooth and two smaller tubercles between these ; a small 

 angular projection beneath each compound eye on each side of 

 the mentum. Labium as in PI. v, Fig. 19. 



Thorax: prothorax with flattened pronotum, the projecting 

 lateral margins of which are slightly upturned; venter with a 

 tooth beneath each coxa and a transverse ridge between them ; 

 mesosternum with a blunt tooth beneath each coxa and a trans- 

 verse ridge between ; there is also a sharper tooth above each 

 mesocoxa; metacoxae with only a slight projection beneath and 

 a ridge extending mesad from these but ending on each side about 

 as far mesad as the inner margin of the mesocoxae ; wing pads 

 extending about to the middle of abdominal segment 4 ; legs with 

 femora and tibiae triangular in cross-section, the procoxae winged 

 below ; all parts entirely without setae or spines ; tarsi brown, 

 darker at tips, the remaining portions of the legs black or brown ; 

 hind femora extending caudad to middle of the sixth abdominal 

 segment ; hind tarsi with three segments. 



Abdomen : flat with lateral spines on segments 2-8, the abdomen 

 suddenly contracted to the tip of the abdomen behind segment 8; 

 anal appendages short, the superior flat and broad at base ; the 

 laterals about half as long as the superior and inferior appendages. 



Nymph described from a female cast skin obtained at North 

 Colebrook, Conn. The adult was found a few inches away, above 

 the cast skin, on a tree stump. Nymphs were also taken at Orange. 



Measurements: total length, 36-38 mm.; abdomen, 23 mm. ; 

 width of abdomen, 20 mm.; length hind femora, 12-13 mm. 



Adult, male. — Color black or dark brown, marked with green- 

 ish yellow. 



Head: mouth parts, labrum, clypeus, genae, front nearly to 

 the level of the antennae, and a short transverse stripe on the 

 occiput, just below the vertical ridge, yellow ; remainder of the 

 head black ; dorso-mesal angles of the eyes pale ; lateral ocelli 

 each with a large pilose tubercle behind it. 



Thorax : prothorax black with two small yellow spots on the 

 dorso-meson and a spot on the pleura just above the coxae ; meso- 

 and metathorax black or dark brown with ridges behind meso- 

 stigmal plates, dorsal carina, a stripe about i mm. wide from the 

 paraptera to within i mm. of the mesostigmal ridges on the mes- 

 anepisterna, yellow; another much narrower yellow stripe on the 

 anepisterna near ventral border and interrupted at its caudal end; 



