NO. 2192. DRAGONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 513 



almost to the lower edge of the side. The lateral apical wedge in the 

 male represented by a broad lateral stripe extending from the vertical 

 carina to the apex of the segment. 



Segments 3-8 as in the male. 



Segments 9 and 10 black, as are the appendages. 



The measm-ements of the three Philadelphia specimens are as fol- 

 lows : 



No. 1, male, abdomen (incl. app.), 49 mm.; hind wing, 42. 



No. 2, male, abdomen (incl. app.), 53 mm.; hind wing, 43. 



No. 3, female, abdomen (incl. app.), 51 mm.; hind wing, 47. 



Structm'ally this species is characterized by the following : A large 

 hairy tubercle (fig. 108) on the ventral side of the metathorax, the 

 male superior appendages with a low tubercle about midway of the 

 edge, the inferior appendage with its lobes acute, widely spreading, 

 but with merely a suggestion of a median terminal lobe (figs. 112-114.) 

 (See also figs. 109-110, penis and hamules.) Female with the stylus 

 of the genital valve arising below the apex (see fig. 111). 



TACHOPTERYX THOREYI Selys. 



The foUowing summary of the habits of this species is from Mr. 

 Wilhamson's pubhshed paper on the subject. 



On June 4, 1900, Mi'. D. A. Atkinson collected the only known 

 njrmph of this species in a boggy spot near Pittsburgh, Pennsylvania. 



In the boggy spot, where the nymph was collected, at that time the only surface 

 water was retained in small depressions, such as the tracks of cattle, among the roots 

 of sedges and grasses. On July 15, 1900, Mr. J. L. Graf observed a female oviposit- 

 ing in this same swale. She alighted among the dense grasses and placed the eggs 

 among the roots or in wet decaying vegetable matter above the surface of the water. 

 She would raise or lower her abdomen 8 or 10 times in one place, then fly to another 

 spot. On June 23, 1900, Mr. Graf discovered another female ovipositing. A mere 

 thread of water flowed from several small springs. The bed of this small stream 

 was composed of cinders and sand. The dragon fly alighted in the grass near this 

 stream and placed her eggs in a small depression in the cinders. This depression con- 

 tained not more than a tablespooniul of water. Into this small basin she thrust her 

 abdomen a number of times at the rate of 15 or 20 times a minute.' 



This same paper gives a very detailed description of the nymph 

 mentioned previously. TS/li. WiUiamson very kindly loaned me his 

 drawing, which I have reproduced as figure 121. 



In its heavy awkward shape the nymph is perhaps adapted to slow 

 but powerful movements in bogs and mud. It is pecuhar in its 

 labium with the cleft median lobe and in the prunitive, imspecialized 

 form of the antenna (see figs. 122-123). 



Prof. J. G. Needham^ writes that this species has been taken from 

 Massachusetts to Florida and Texas. 



1 Ent. News, vol. 12, 1901, pp. 1-3. » Bull. 47, N. Y. State Mus., 1901, p. 472. 



65008°— Proc.N.M. vol.52— 17 33 



