No. 39] ODOXATA OF CONNECTICUT: GOMPHIDAE 1 29 



katepisterna with ventral half yellow and a small yellow spot near 

 dorsal border ; epimerum with a stripe 2 mm. wide from wing 

 'paraptera to near cephalic margin, and a .5 mm. stripe below it 

 to within a short distance of the spiracle ; margin just above the 

 katepisterna yellow ; about ventral third of katepisterna also yel- 

 low; metepimera entirely yellow except a stripe 1-.5 mm. wide 

 on dorsal border and the black latero-ventral margins ; inter- 

 sternum yellow ; lateral surfaces of coxae yellow or partly yellow, 

 remainder of legs black; all femora with short spines irregularly 

 placed, most of them on ventral surfaces ; tibiae with two rows 

 of longer setae beneath and two shorter rows above. Tarsal claws 

 with a tooth below nearly two-thirds the length of the claw from 

 the base ; wings as shown in PI. ix, Fig. 4. 



Abdomen: black with a mid-dorsal line of yellow on 1-7, wider 

 on I and 2, and a spot on basal half of 8; caudal half of dorsal 

 stripes sometimes obsolete. Ventral half of sides of terga i and 

 2 yellow; ventral margins of all terga except 10 with more or less 

 yellow; ventral margins of terga 8 and 9 projecting ventrad 

 much below the surface of the sterna. Anal appendages as in Fig. 

 24, Nos. 7 and 8. 



Female. — Coloration similar in most features to the male but 

 the thorax usually has more yellow ; the anal margins of the wing 

 are rounded. Ventral margins of ninth tergum separated by 4.5-5 

 mm. ; vulvar lamina consisting of 2 broad triangular lobes 1.5 mm. 

 long by I mm. wide. 



Measurements : total length, male 74, female 74 mm. ; length 

 of abdomen, male 54, female 53 mm. ; length of hind wing, male 

 49, female 49-51 mm.; width of hind wing, male 13-14 mm.; 

 female 12-13 mm.; length of stigma, male 5.5, female 5.5-6 mm. 



Connecticut.— East Haven, 19, 24 June, 1908 (B. H. W.) ; North Cole- 

 brook, 19 June, 1920 (P. G.) ; Litchfield, 17 July, 1910, 3 July. I9i6 

 (L. B. W.). 



New England. — June 15-September 3. 



Genus Ophiogomphus Selys 



Nymphs. — Proximal segment of the labial palpus rounded at 

 apex; third segment of antennae flattened, nearly equal in width 

 throughout ; fourth segment short, its length not equal the width 

 of the third segment ; middle legs not more approximate than the 

 front legs; abdomen considerably longer than broad, and with 

 very small dorsal projections sometimes with hooks; ninth abdom- 

 inal segment without an acute dorsal apical spine. 



Adults. — Wings without subcostal vein ; triangles without cross- 

 veins ; anal loop consisting of three to four cells ; occiput with a 

 distinct occipital ridge between the compound eyes, and sometimes 

 tooth-like projections besides; dorsum of thorax green or yellow 

 with brown markings : hind femora with very short spines, and 



