92 DRAGONFLIES OF NORTH AMERICA 
clutch of 5200 eggs was obtained from a single female by dipping her 
abdomen in a watchglass of water (see p. 44 for the method). 
Transformation occurred in the early morning, and the cast skins 
were left on the sides of barges, bridge piers and stumps a foot or two 
above the surface of the water. 
35. Gomphus crassus Hagen 
Hag. ’78, p. 453: Mtk. Cat. p. 91: Wmsn. 719, p. 294: Garm. ’27, p. 162. 
Length 54 mm. Expanse 70 mm. Ont. to Tenn. 
Another species with the same vestiture of soft black downy hairs on thorax 
and base of abdomen, and the same general coloration, the color differing only 
in that the black is a little less extensive; the spots on the middle abdominal 
segments are a little larger, and there is usually a trace of yellow on the dorsum 
of abdominal segments 9 and 10. It is to be distinguished by the form of the 
genitalia shown in the figures herewith. 
Williamson (’20) remarks of this species that is is often seen bowling 
its way over the asphalt streets in the business part of town (Bluffton, 
Ind), and at such times may frequently be captured clinging to screen 
doors. 
36. Gomphus confraternus Selys 
Selys ’73, p. 744: Mtk. Cat. p. 90: Kndy. 17, p. 558 (as sobrinus) 
Syn: sobrinus Selys 
Length 55 mm. Expanse 80 mm. Calif., Ore., Wash. 
A stout green-and-brown striped, west coast species, with a very moderate 
enlargement of the terminal abdominal segments. Face and occiput yellow. 
Thoracic stripes of the first pair are almost parallel-sided and narrower than the 
bordering green. They are abbreviated below, where conjoined to the collar band 
by a narrow median line of brown. Stripe 2 is notched above next the crest, con- 
fluent with 3 (which is of about equal breadth) except for a narrow dividing line 
below, and broadly joined to the collar band of brown. Stripe 4 incomplete, not 
extending above the spiracle, but almost confluent with 5 at that level. Stripe 5 
well developed and broad. Wings hyaline, stigma brown. The middorsal line 
of yellow triangles on the middle abdominal segments ends in a basal spot on 
segment 8 or 9. Segment 10 above and appendages black. The yellow spots on 
the side margins of segments 8 and 9 do not reach the apical border of those 
segments. 
Kennedy (’17) says this is an early spring species, appearing in April 
and gone by July, and it inhabits the warmer constant streams of 
moderate size and to a lesser extent the ponds. 
In May I found it very abundant on Coyote Creek within the city limits of 
San Jose, where in a single day’s collecting I succeeded in taking over 50 speci- 
mens. 
