No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 205 



teeth as wide as deep, each tooth with long heavy setae, which 

 increase in number from 2 on tooth next the movable hook to 8 

 or 9 on the tooth next the caudo-mesal angles ; margins of each 

 tooth crenulate ; distal margins of mentum spinulose ; mental 

 setae 7-8 on each side, and a number of minute setae between the 

 two rows of longer ones ; head widest across the eyes, the caudo- 

 lateral margins bluntly angulate. 



Thorax : legs with long femora and tibia, the tibiae of the hind 

 femora extending to the middle of segment 9 or beyond; tarsal 

 segments composed of one short and two long segments. 



Abdomen: with prominent dorsal hooks on middle of segment 

 2-9 inclusive, and lateral spines on segments 8 and 9, that on 9 

 about as long as segment 10; lateral terminal appendages three- 

 fourths as long as the ventrals. 



Measurements; immature nymph : total length, 17 mm.; abdo- 

 men, 10 mm. ; hind femora, 7 mm. ; wing cases, i mm. 



Two immature specimens received from Kentucky; others 

 examined in Cambridge Museum of Comparative Zoology. 



Adult, male. — Color black and yellow. 



Head : labium, labrum and clypeus pale ; front brown with a 

 yellow spot or two spots on each side; vertex and occiput dark 

 brown. 



Thorax : dorsum without yellow, each side with a yellow stripe 

 on metepisterna from legs to wing bases and about i mm. wide; 

 legs black or dark brown, the distal half of front and middle 

 femora with a prominent carina beneath; wings (Pi. xi, Fig. i) 

 usually clear, triangles usually with cross-veins (sometimes free). 



Abdomen : black and yellow ; tergum 2 with a yellow trans- 

 verse band interrupted on the meson and at the auricles; terga 3 

 and 4 each with 2 yellow triangles, the caudal margins of which 

 are in contact with the median transverse carinae ; spots also pres- 

 ent on 5 and 6 ; tergum 7 with a transverse yellow basal band, from 

 cephalic margin to the transverse carina, the yellow not reaching 

 the lateral margins and extending a trifle along the dorsal carina ; 

 tergum 8 with a pale triangle at base ; terga 9 and 10 black ; anal 

 appendages black ; viewed from above, the superiors are lyre- 

 shaped ; viewed from the side, the superiors are seen to possess a 

 carina which extends slightly beyond the middle; beyond the tip 

 of the carina the superiors are denticulate beneath ; inferior 

 appendage slightly longer than the superiors. 



Female. — Similar to the male; abdominal spots larger. 



Measurements: total length, male 61-66, female 65-72 mm.; 

 length of abdomen, male 44-46, female 51 mm.; length of hind 

 wings, male 40-42, female 46-47 mm. ; width of hind wings, male 

 II, female 13 mm. 



New England. — Recorded by Howe from Maine, Massachusetts, New 

 Hampshire and Rhode Island, June i6-August 16, but not yet collected in 

 Connecticut. 



