596 GEOLOGICAL SURVEY OF THE TERRITOEIES. 



of about se\en stronger black teetb ; tbe inferior appendage large, much 

 broader tbau tbe superiors and of the same length, the aincal half divided 

 by a larger semicircular notch ; viewed from below the two branches, 

 large, quadrangular, obliquely truncate, the angles sharp; viewed later- 

 ally incurved, thicker before the recurved tip, the outer angles form- 

 ing a large superior tooth ; genital parts on the second segment with 

 the first hamule black, a very long, flat lobe, incurved more on tip; 

 indeed, they are similar to 0. rupinsulensis, the base is broader, and the 

 excision beginning at the base is so large that tbe superior angle alone 

 exists; second hamule longer, brownish, broad, flat at base, the other 

 part forming a slender, very long lobe, strongly recurved and sud- 

 denly again incurved, the apical part straight; sheath of the penis hol- 

 lowed, ovoid, bifid on tip; the two branches conical, divergent; penis 

 with two short black spines on tip, and an inferior tooth on 2d joint ; 

 earlets greenish-yellow, rounded, with a series of black spines on the 

 posterior inner angle ; feet black; femora somewhat villous, with very 

 short spines, the four anteriors with a greenish band on the inner side; 

 wings hyaline ; veins black ; costa yellow ; pterostigma oblong, blackish- 

 brown, covering 3 (or 5) cells ; 2 discoidal areolets ; 12-13 antecubitiils; 

 9 postcubitals ; membranula very small, whitish. 



Female (type described by Mr. Walsh). More adult; the labium 

 brownish-black, with a yellowish, basal spot; lateral lobes blackish on 

 the inner border and tip ; vertex blackish, with a rounded, yellow, mid- 

 dle spot and a yellow dot on each side; occiput inflated, ciliated above, 

 emarginated behind, and on each side with a rounded tubercle; the su- 

 perior edge rounded in the middle with two, but little separated, coni- 

 cal processes, ending in long, sharp, stronglj^ incurved spines, converging 

 so as almost to touch at their extreme black tips ; eyes behind black, 

 with a large, inferior, yellow spot, divided in the middle; thorax as in 

 the male, the lateral bands on the dorsum separated from the antehumernl 

 by a narrow, yellowish band, nearly confluent above; an accidental 

 black spot on the left side near the sinus ; abdomen stouter, more clav- 

 ate on tip ; dorsal spots as in male, none on the three last segments : 

 appendages about as long as the tenth segment, yellow, conical, sharp; 

 lobe between obtuse, yellow; vulvar lamina yellow, nearly as long as 

 the segment, oblong, bitid on the apical half, a little broader before an 

 apical exterior indention, the tips sharpened, bent outward ; feet as 

 in $ , the posterior femora with a greenish si30t before the tip ; wings as 

 in the male; costse black, but near the base the formerly yellow color 

 is visible; pterostigma a little longer, covering 5-6 areoles; 14-15 

 antecubitals ; 13 postcubitals. 



Length of body, 46 millimeters; alar expansion, 56-60 millimeters; 

 pterostigma 2| — 3 millimeters. 



Habitat. — Maine, by Dr. Packard; I have seen only one pair; the fe- 

 male is the type of Mr. Walsh, in the collection of the Peabody Acad- 

 emy, in Salem, Mass.; the male, in the collection of Mr. Uhler, Baltimore, 

 Md. Both were collected by Dr. Packard at the same locality, and there 

 is no doubt that both belong to the same species. A translation of 

 Walsh's description is given by De Selys's in his second addition to 

 Synopsis of the Gomphines (p. 45), but the vertex and occiput were not 

 exactly accurate in Walsh's text. In the third addition (p. 14), De Selys 

 unites the female with 0. rnpinsulensis. As I have described now both 

 species in both sexes, this is apparently erroneous. 0. Mson, from Cali- 

 fornia, is described by De Selys in the appendix to the third addition 

 (1874, p. 51) after an incomplete female. 1 have not seen the type; the 

 only difference from 0. mainensis consists, according to the description, 



