No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 209 



Thorax : brown or metallic green or blue, with white hairs ; 

 legs black, the femora with short spinules ; spines of the tibiae 

 much longer; tarsi and claws black; wings (PI. xii, Fig. 4) clear, 

 the fore wings with dark basal spots covering the first two (some- 

 times more) of the antenodal cross- veins; hind wings with similar 

 spots, and also spots in the 2-celled anal triangle. 



Abdomen : black with brown on sides and dorsum of i ; cephalic 

 portion of 2 below the auricles, basal third of 3, and cephalo- 

 lateral angles 4 to 8 inclusive pale ; 9 and 10 mostly black ; lateral 

 carinae present on segments 4 to 9 inclusive, absent on 1-3 ; anal 

 appendages black, the superiors in lateral profile, bluntly pointed, 

 almost truncate, with a faint indication of a submedian inferior 

 tooth ; inferior appendage three-fourths as long as the superiors ; 

 viewed from below, the inferior is about three-fifths as broad at 

 apex as at base, and has a blunt apical tooth on each side, the 

 apical margin being shallowly concave. 



Female. — Similar to the male. 



Anal appendages black ; vulvar lamina a little shorter than seg- 

 ment 9, divided into two pointed plates by a median incision, their 

 lateral margins with minute teeth; segments 3, 4, and 5 not con- 

 stricted as in the male, and spots on cephalo-lateral angles larger. 



Measurements: total length, male 46, female 41 mm.; length 

 of abdomen, male 29-31, female 28 mm. ; length of hind wings, 

 male 28, female 27-28 mm. ; width of hind wings, male 8.5, female 

 8.5 mm. 



Connecticut. — Woodbridge, 20 May, 1923 (W. E. B.) ; Litchfield, 31 

 May, 1915, 17 June, 1924, 6 June, 1925 (L. B. W.) ; Storrs, 1925, C. B. 

 Brink. 



New England. — May 15-July 12. 



Genus Tetragoneuria Hagen 



N5miphs. — Without frontal horn ; the hind angles of the head 

 rounded ; mental setae 6 to 9, palpal or lateral setae 7 ; dorsum of 

 abdomen with hooks on 2-9 ; lateral spines of segment 9 exceeding 

 the terminal appendages. 



Adults. — Arculus sectors separated from point of union with 

 the arculus; triangle of front wings with cross-vein; subtriangle 

 absent, there being only one cubito-anal cross-vein ; area between 

 M4 and Cui not expanded at margin of front wing ; bases of hind 

 wings dark ; compound eyes meeting in a short line on dorsum ; 

 female with a long forked process on venter of segment 8; abdo- 

 men not contracted or compressed laterally (except segments 3 

 and 4 of the female) but for the most part depressed; no metallic 

 green or blue. 



For literature on this genus, see 

 Muttkowski, R. A. Bulletin of the Wisconsin Natural History Society 

 13: 49-61: 1915. 



