HAGEK.] ZOOLOGY PSEUDO-NEUROPTERA AND NEUROPTERA. 583 



tened; the segments, 2 to 9, produced on each side, in a large triangular 

 process, bent behind, very sharp at the tip ; abdomen pale-gray on each 

 side, above a series of brown spots, with some in the middle between 

 them ; the triangular processes, on the segments 4 to 9, dark-browu, with 

 a pale ring before the extreme tip, which is again blackish; segments 

 4 to 7, above each side, with a large flattened orbicular gill inserted be- 

 neath the hind border of the segments, wbere the lateral process begins ; 

 all lateral processes covered and fringed with wooly hairs ; last segment 

 short, transversely oblong; the dorsal apical border produced in the 

 middle ; the three sette a little shorter than the abdomen, equal, slender, 

 pale; the fourth joint with a black, apical ring; on the apical third 

 four segments black, also the tip; setce fringed with long hairs; feet 

 flattened ; the femurs dilated in the dorsal middle, ending in a superior 

 spine, pale with three brownish bands; tibite black at the base and the 

 apical half; tarsal joint black on the basal half and on the tip; the 

 single claw pointed black at tip. Genital parts of the male on the ven- 

 tral side of the ninth segment, forming on tip a transversal lobe, with a 

 triangular longer one on each side, and a little before an elongated bifid 

 lobe; the female has the ninth segment produced in a larger elliptical 

 lobe. 



Length, without setae, 15 millimeters; setae, 7 millimeters; greatest 

 breadth of the abdomen, 5 millimeters. 



Ilahitat. — Colorado, mountains and plains, July 19, September 19, Mr. 

 Carpenter. Three skins of the nympha. 



Tbe form of the nympha is a very extraordinary one; so far as I know, 

 the next related is the nymplia of Heptagenia, and considering the large 

 size it would not be improbable that this nymplia belongs to R. pudicti. 



Family ODOXATA. 



Subfamily Libellulina. 



The genera Fantala., Tramecij and PlatJiemis are not yet represented 

 in the collection of tlie expedition ; nevertheless, it is very probable 

 that some of the widely-spread species of those genera occur in the 

 Territories. P. hymencea, T. lacerata^ and PI. trimaculata will, perhai)S, 

 be discovered there. 



LIEELLULA. 



L. 4:-macuIata, Hagen, Synop. 150, 1. 



Habitat. — Snake Eiver, Idaho, and Ogden, Utah, collected in 1871 by 

 Mr. C. Thomas; Bridger Basin, Wyoming, by JMr. S. W, Garman. This 

 species migrates in immense flocks in the Saskatchewan district, in 

 Canada, in Wisconsin, and around Lake Michigan, just as in Europe 

 and in Siberia. Stowe, Mass., is thi most southeastern limit for the 

 United States; it is very common in Northern and Central Europe and 

 in ISTorthern Asia as far as Kamtchatka. 



L. nodisticta, Hagen, Synop., 151, 3. 



Male adult. — Pruinose, clothed with white hairs. Labium yellow, with 

 a large black band strongly coarctate just before the tij); labrum 

 luteous, a blackish border on the anterior margin, not reaching the 

 sides, and some ill-defined brownish spots in the middle and on the 

 basal margin; rhinarium and epistoma luteous; front brassy, black 

 above and before, with a bright-yellow spot on each side near the epis- 

 toma. Antennae black; vertex brassy-black, inflated, narrower at the 



