210 E. B. WILLIAMSON. 



4. Ci(Oin|>liii!« iiotatiiji) Ramhur. Ins. Nevr., p. 162, 1842. 



Ab. % 40-42; 9 41-43. H. w. % 32-33; 9 33-34. 



Aiiteciib. f. w. 12-16 ; h. w. 10-12. 



Postcub. f. w. 8-11 ; h. w. 7-10. 

 Face pale greenish brown (tenerals) to obscure brown ; labruni greenish bor- 

 dered with black and with a wide median stripe of the same color; anteclypeus 

 dark, with the depressions of the postclypeus also dark (%), or anteclypeus 

 paler, only the slightly darker markings present ( 9 ) ; front in frons dark 

 reddish brown ( ^ \ or the same color as the postclypeus ( 9 ) ! above green- 

 ish, basal half reddish brown which is produced in the middle in front, usually 

 interrupting the greenish area; eyes in life green above, gray below. Meso- 

 thoracic half-collar usually but not always narrowly interrupted at the middle; 

 mid-dorsal carina black, or with the extreme edge yellowish ; dorsal stripes 

 isolated; antehumeral stripe slightly constricted above; humeral and two lateral 

 sutures each with a complete dark stripe, the humeral the widest. Abdomen 

 with a much reduced maculose longitudinal mid-dorsal stripe. Legs black, 

 first femora paler beneath ; in tenerals the femora are pale, darker apically and 

 on the upper surface. 



*£ . — Accessory genitalia blackish; second hamule slender, simple, not turned 

 forwards; coloration of last segments and dilation of 7-9 as in spiniceps. 



9 . — In the form of the crest of the occiput and the variation in the develop- 

 ment of the spine between each lateral ocellus and eye, the same that has been 

 said for spinicep» holds here; two forms of occipital crests are figured. Abdomi- 

 nal segments 8 and 9 scarcely dilated, colored about as in spiniceps: vulvar 

 lamina about one-twentieth as long as sternum of 9, or less. 



In one male (Rock Island, Illinois ; Walsh. M. C. Z.), doubtless 

 studied by Hagen (Quatr. Add. Syn. Gomph., p. 61, or 466), the 

 median longitudinal stripe of the labrum is represented l\y only a 

 median spot. In this teneral specimen the whole face is pale, only 

 frons above in front slightly darker, and lateral depressions of the 

 postclypeus and margins of labrum, black. This description of 

 labrum applies also to a female type of Walsh's Jiuvialis in the 

 U. S. Nat. Mus, It is probably to be largely explained by the fad- 

 ing of these teneral specimeus. The material from Irontou, Ohio, 

 all teneral, does not so vary, however. 



Material Examined. 

 3 % ,2 9 , Ironton, Ohio; June 1, 1899. R. C. Osburn. 

 3 S, 3 9, Ironton, Ohio; June 1, 1899; J. S. Hine, collector. 

 Ohio State University. 



1 S , 1 9, Ironton, Ohio; June 1, 1899; R. C. Osburn, collec- 

 tor. E. B. Williamson. 



2 % ,1 9, Cumberland River, Nashville, Tennessee; September 

 30, 1900. E. B. Williamson. 



