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



Gomphus spicatus Hagen 



Bulletin de I'Academie royale . . . de Belgique, 21 : 54 : 1854. 



Nymph. — Head: labium as in PI. v, Fig. 15,2^ distal margin 

 of the mentum between the palpi convex and with a thin fringe of 

 flattened setae ; fixed hook of the palpi bent strongly mesad, and 

 with about 7 short teeth on the inner margin. 



Abdomen: tapering (Fig. 17, D) with conspicuous lateral scars, 

 those on 4-8 inclusive divided into several irregular conspicuous 

 areas by lines of hairs ; scars on each side of 9, linear ; segment la 

 almost glabrous ; segment 9 with a minute dorsal projection on the 

 hind margin, but none on preceding segments, lateral spines pres- 

 ent on segments 7, 8 and 9, that on 9 two-fifths as long as segment 

 10; lateral terminal appendages four-fifths as long as the 

 ventrals. 



Measurements ; f uU-grown nymph : total length, 25 mm. ; 

 length of abdomen, 15 mm.; width of abdomen, 6 mm.; greatest 

 width segment 9, 3.5 mm. ; length on mid-dorsum, 2.25 mm. 



Nymph collected at Colebrook, Conn., 19 June, 1920. 



Adult, male. — Color olive-brown marked with greenish yellow. 



Head : greenish yellow except the black area bounded by post- 

 ocellar ridge or epicranial suture, compound eyes and transverse 

 line cephalad of the antennae, rear of head yellow below, dark 

 brown or black above. 



Thorax : dark brown, with olive marks as in Fig. 22, No. 1 1 ; 

 venter pale gray, legs with brown coxae and trochanters, and 

 proximal two-thirds of the dorsa of the tibiae pale. 



Abdomen : segment 3 considerably contracted in the middle ; 

 terga 2-7 with a pale mesal line, which, however, is obscured 

 towards the caudal margins of 5, 6 and 7 ; terga 8 with a spot on 

 cephalic margin on meson; about half the lateral surfaces of 

 terga i, 2, 3, and 9, yellow or pale ; obscure lateral marks on 4-8; 

 venter of abdomen black; segments 7, 8, 9, and 10 measured on 

 dorso-meson, 3.5, 3, 2.5, and i mm. long. Superior anal appen- 

 dages (Fig. 21, Nos. 3, 6) viewed from above, pointed, divaricate, 

 the mesal margins nearly straight, lateral margins broken, forming 

 a tooth just proximad of the mid point ; in lateral profile the supe- 

 riors with a sharp ventral tooth opposite the tooth of the lateral 

 margin; inferior appendage with slender upcurved arms joined 

 to a rather narrow basal plate, the tips of the arms black ; superior 

 appendages 1.5 mm. long; accessory genitalia consisting of very 

 slender black cephalic lamina with two teeth at tips ; hamules flat, 

 distal half narrowed to a hook (Fig. 21, No. 14). 



Female. — Color and color pattern similar to the male . 



Head : postocellar ridge almost W-shaped, the lateral ends con- 

 siderably higher than the rest of the ridge ; semicircular ridges 



^ The variations in the nymphal labia of this species have been described by Miss 

 Stout, Entomological News ag; 68-70: 1918. 



