1874.] 357 [Hagen. 



find differences between P. borealis and Abbot's species. It is worthy 

 of notice, that Mr. Cabot in his monograph of the immature state of 

 the Gomphina, p. 6, has described some nymphae from Wareham, 

 Mass., supposed to belong to a species of Progomphus. 



Male. The description is made from a male from Georgia in Mr. 

 J. Riding's collection. 



Head pale yellow; an obliterated darker transversal band on the 

 front, near the epistonia; rhinarium and an ill-defined middle part 

 of the epistoma obscure ; a transversal brown band above on the 

 front, just before the ocelli, the middle part of it rounded, produced 

 without reaching the anterior margin of the front; antennae dark 

 brown, the tip of the three basal joints palely annulated; space be- 

 tween the eyes dark brown ; vertex broad, short, deeply excavated 

 in the middle, yellow, the sides and front margin brown; occiput 

 yellow, ciliated behind with pale hairs, broad, the border rather sharp, 

 slightly emarginated, darker on the sides ; eyes behind brown, each 

 side near the margin two inferior yellow spots; thorax brown, the 

 dorsum with an anterior transversal band connected with an oblique 

 band, both yellow and converging, not reaching the sinus ; farther out- 

 wards an inferior yellow humeral line and a yellow superior spot; 

 crista of the thorax yellow to its bifurcation ; sides of the thorax 

 brown, with two ill-defined oblique yellow bands; beneath pale brown, 

 behind the posterior feet a larger blackish spot each side ; abdomen 

 slender, cylindrical, the base and the last segments enlarged ; seg- 

 ments two to seven with a dorsal spear-shaped fascia, reaching the 

 apical margin in two and three, gradually shorter in the others ; seg- 

 ments one to three largely yellow, the following much less so ; seg- 

 ments seven and eight each side with an inferior yellow middle spot ; 

 venter black ; earlets compressed, yellow, the band rounded ; last seg- 

 ment half as long as the penultimate ; apical margin rather recurved, 

 cut straight in the middle of the margin, more obliquely above the ap- 

 pendages ; superior appendages yellow, a little darker at base, nearly 

 twice as long as the last segment, broad, flat, the apex rounded in- 

 side, curved slightly outwards, ending in a sharp black point; inferior 

 appendages black, shorter, cylindrical, stronger to the inwardly bent 

 fusiform tip, with two superior small teeth just before tip ; outside 

 somewhat before, a short black tooth ; genital parts on the venter 

 of the abdomen with a short erect luteous middle spine ; first hooks 

 not visible (perhaps not existing), second hooks large, yellow, taper- 

 ing to the strongly inwardly bent black, sharp tip ; sheath large, erect, 



