72 



5. Gomphus ahhtrriatifs Hag. 



The nymph was collected and bred by Mr. Needham at 

 Ithaca, N. Y., and is here described for the first time. It is not 

 an Illinois species, and seems quite rare and limited in range, 

 imagos being recorded only from Maine, Massachusetts, and 

 (with doubt) Pennsylvania. The only date found recorded for 

 the imago is June 10 (Harvey). 



The nymph measures 24 mm.; abdomen, 15 mm.; hind fe- 

 mur, 5.5 mm.; width of head 5.5 mm., of abdomen 8 mm. 



Body very flat, very scantily hairy on the margins. An- 

 tennae with the third segment flattened and widened toward 

 the tip. Labium short ; mentum narrowed in its basal fourth, 

 beyond which the sides are parallel, median lobe a little con- 

 vex and with a median marginal tooth in the midst of the 

 fringing flattened hairs ; lateral lobes regularly narrowed and 

 incurved to a point which is a little longer than the teeth on 

 the inner border ; teeth about eight, quadrant-shaped, pointed 

 at the lower apical angle, successively decreasing in size prox- 

 imally. 



Abdomen flat oval. Conspicuous lateral spines on seg- 

 ments 6 to 9, increasing in stoutness posteriorly, the last about 

 as long as segment 10. Dorsal hooks represented by minute 

 rudiments on 8 and 9 ; a smooth median line anteriorly to this. 

 Appendages yellow, almost twice the length of the 10th seg- 

 ment, the laterals a little shorter than the others, the superior 

 a little bent upward at the extreme tip. 



6. GoinpJius rastus Walsh. 



Walsh found this species emerging in company with no- 

 tatns a-ndfrafemus "in considerable numbers" at Rock Island, 

 on the Mississippi, and described the imago as a new species 

 ('62, p. 391). Riley (Hagen, '85, p. 265) also reared it from the 

 Mississippi River at Hannibal, Mo. (not "111."). The nymph is 

 in Dr. Kofoid's private collection, taken in deep water in De- 

 troit River. The imago is reported from Illinois, Iowa, Indiana, 

 Michigan, Ohio (common in July), Pennsylvania, and several 



