Scudder.] 220 



inferior is curved upwards somewhat ; the median tooth beneath is 

 denticulated anteriorly ; the genital hamule has the apex bifid, the 

 posterior branch triangular, bluntly pointed, longer than broad, the 

 anterior branch forming an unguiculus which is one-third the length 

 of the whole hamule, directed backwards and inclining in the least 

 degree towards one another. 7-8 antecubitals ; G-9 postcubitals. 



Length S 1.34-1.40, ? 1.14; alarexpanse 1.96-2.16 in.; pterostig- 

 ma .08 in.; abdominal appendages (5 .05 in. 5 (? , 2 ? . August, sum- 

 mit of Mt. Washington and also in the valley. 



During life the whole of the front ai^d mouth parts are pale yellow- 

 isli-green, except the maxilla and tips of mandibles and an antennal 

 band, black ; eyes dull ferruginous above, below tinged w4th oliva- 

 ceous; dorsum of thorax olivaceous-brown (<?) or olivaceous-green, in 

 less mature specimens dull brownish ( ? ) ; pleura tinged slightly with 

 reddish, especially behind ( <5 ) or yellowish-green, especially behind, 

 in less mature specimens greenish above, yellowish below, merging into 

 one another, with a brownish spot at base of hind legs ( ? ) ; abdomen 

 either bright blood-red, except first segment, which is dark yellowish- 

 brown with a blackish-brown transverse streak, lateral spots black, 

 subdorsal spots faint yellowish-brown, on segment 3 amber, (5 ) or dor- 

 sum blood-red, last segment tipped with yellowish, the transverse spots 

 olivaceous ; sides yellowish, olivaceous-green, the spots black, below 

 the spots with a whitish pruinosity ; beneath, segments 1-8 black, 9-10 

 yellowish-brown (?) or In less mature specimens of ? , light and bright 

 olivaceous, segments reddish, the spots black. 



I am inclined to consider as identical the species described by Ha- 

 gen in his Synopsis as No. 1, the assimilata of Uhler and No. 6, the 

 rublcundulaof Say, with which ambigua of Rambur is placed as sy- 

 nonymous. 



Through the courtesy of Mr. Uhler I have examined with consider- 

 able care, and at several different times, the specimens of both, which 

 are found in his collection. The specimens of assimilata are the same as 

 those used by him in his original description of that species, and they 

 seem to differ in a very slight degree from all the specimens of rubi- 

 cundula which I have seen, in the shape of the posterior genital ha- 

 mule and the genital lobe of the $ , and in the bifid portion of the vul- 

 var lamina of the ?; the former (assimilata) in the genital lobe of the 

 6 is long and slender, nearly equal throughout ; in the latter it is 

 more triangular, much broader at base than at tip, the tip rounded ; 

 so, too, tlie posterior genital hamule is slenderer and less triangular in 

 the former than in rubicundula ; the hamules are less extruded in my 

 specimens of the latter, than in those I have seen of the former, but 

 this may be purely accidental ; in the latter, the lobes of the bifid por- 

 tion of the vulvar lamina of ? are separated from the base by a dis- 

 tinct, equal channel ; each is sub-carinate, conical, pointed ; in assimi- 



