41 



markings on the darker ground-color; outer api- 

 cal angle of lateral labial lobes not rounded. 

 ee. Hind angles of head prominent; quite young exam- 

 ples (7 mm.) with separate spots at the posterior 

 ocelli, the l)ody not transversely banded. 3. sp. ( a). 

 (>. Hind angles of head rounded; young examples (10 

 mm. or less) with a trilobed spot at the back of 

 the head above, the metathorax, a V-shaped spot 

 on the base of the abdomen, and segments 6 and 

 7, all pale.* 4. sp. (/;). 



d. Superior appendage fringed laterally with blackish 

 hairs; posterior part of head pale, with a dark lateral 

 stripe, a median pair of dark spots, and the poste- 

 rior margin dark; outer apical angle of lateral labial 

 lobes narrowly rounded; head behind the eyes short. 



5. caVifornica. 

 c. Apices of lateral labial lobes exteriorly broadly curving 

 to the acute terminal hook at the inner apical angle, 

 not contiguous when closed; color dark brown, a fine 

 median pale line on labrum, a transverse spot at the 

 anterior ocellus, behind which are two pairs of small 

 spots; a line median whitish line on thorax and abdo- 

 men, vanishing near the middle of the abdomen. 



6. rerticalis. 

 1. ylilscJuia clepHiidra Say. 



^schna eremitica Cabot (nymph). 



This wide-spread species has been found in the northern 

 part of Europe and Asia, but especially in North America, ex- 

 tending south as far as the Dakotas, Wisconsin, Indiana, north- 

 ern Ohio, and Maryland. It has not been taken in Illinois. Walsh 

 reported it from Rock Island ('62, p. 397), but Hagen has iden- 

 tified Walsh's specimens as verticaJis. A number of clepsydra 

 imagos were taken, however, by Mr. Hart at the southwest end 



*In the young .*:/;/</.r ///;///c^ the anterior pale transverse band includes the last 

 two thoracic and the first three abdominal segments, and the posterior band covers 

 segment 8, often also 7, and sometimes even the adjacent part of 6. 



