NATURAL SCIENCES OP PHILADELPHIA. 385 



(plate xii. fig. 5,) while they bear a striking resemblance to those of sangidnea, 

 a South American species, (figured plate x. fig. 6,) and, besides several 

 minor points of difference, by the cross-veins in the basal spots being bordered 

 with subhyaline, a peculiarity which is not noticed as occurring in any other 

 species. No Hetcerina has hitherto, according to Dr. Hagen, been found in a 

 higher latitude, either North or South, than 40. Rock Island lies in about 

 41 30'. 



Lestes rectangularis, Say ! L. unguiculata, Hagen ! L. hamata, Hagen. 

 L. porcipata, Rambur. 



Lestes eurina? Say. [Unknown to Dr. Hagen.] ^ Dark metallic green. 

 Head brown black, varied anteriorly with brown; epistoma obscure greenish ; 

 labrum obscure greenish on its terminal margin, dusky at base, except a small 

 obscure greenish triangle on its posterior margin ; tips of mandibles brown 

 black; beneath pale greenish. Dorsum of thorax rather pale brown, with a 

 fuscous 3 sublateral, slightly abbreviated vitta ; pleura deep bright yellow, the 

 anterior segment with a wide brown stripe in front, sending off a narrow 

 branch behind and below to the intermediate coxae, and widened behind and 

 above by two successive sudden dilatations so as to cover the entire width of 

 the segment beneath the wings ; the posterior segment with a large inferior 

 brown, elongate-triangular spot, its upper side parallel with the wings, and 

 its apex reaching the back of the posterior coxae ; sternum pale. Abdomen 

 with a blue reflection on joints 2 4, the base and sides of joint 1, and sides of 

 2, yellowish, 2 7 with a narrow yellowish basal band, interrupted above and 

 widening below, subobsolete in 6 7; joint 10 triangularly emarginate above 

 at tip, the sides of the emargination carinate, yellowish beneath, and with an 

 obscure yellowish lateral basal triangle ; the tips of segments 1 8 black, 

 more obviously so beneath, and especially towards the tip of the abdomen. 

 Superior appendages piceous, nearly as long as the penultimate joint of the 

 abdomen, with their tips a little dilated and rounded, regularly curved from 

 their middle inwards and downwards, with ten or twelve small spines on their 

 exterior middle, a long acute spine pointing backwards on their internal base, 

 and on their internal middle a short broad tooth, truncate, with four very 

 small spines on it. Inferior appendages short, yellowish, about one-third the 

 length of the superiors, conical, obtuse, directed obliquely upwards and 

 slightly curved inwards at tip. Legs black, coxae and trochanters pale, an- 

 terior femora with a short basal inferior and superior yellowish vitta, both of 

 which become wider and longer on the intermediate and still more so on the 

 posterior femora; tibiae all with an anterior yellowish vitta. Wings uniformly 

 flftvescent, no darker on costa ; veins and cross-veins black; pterostigma 

 brown, surmounting four cells before, three and a half behind. Postcubitals 

 1516. 



Length $ 50 m iH- -Alar expanse tf 64 mill. Length of abdomen $ 41 mill. 

 Pterostigma 2 mill. One <^ specimen, somewhat immature; 9 unknown. 



There is no other described species of North American Lestes which has the 

 wings entirely flavescent, and on this account, and because the coloration of 

 the legs and the structure of the anal appendages agree wi'h Say's brief de- 

 scription, it may probably be the true Eurina, Say, though he describes the 

 dorsum of the thorax as having "a yellow vitta, behind bifid and divaricated." 

 The markings of the thorax are so variable in Agrionina that, by themselves, 

 they cannot be depended on to separate two species otherwise alike. 



Lestes in^qualis, n. sp. ^ Dark metallic green. Head with the region 

 of the ocelli almost black; epistoma pale brown ; tips of the labrum and of 

 the mandibles brown black ; the rest of the mouth and all beneath yellowish ; 

 antenna? black, first and second joints yellowish at tip. Dorsum of thorax 

 livid black, with a slight greenish reflection; a medial and lateral yellowish 

 line ; pleura yellowish, with a broad, livid black stripe in front, widened under 



1862.] 26 



