175 



that they are more acute and the lower edge is less angular. The vulvar lamina 

 in externus, as in fraternua, is not constricted at the middle as it is in crassus. In 

 externus the lamina is bifid for almost half its length ; in fraternus it is bifid for 

 scarcely more than a fourth of its length. Fraternus and externus are about the 

 same in size. 



On page 285, "Dragonflies of Indiana," the references should be to plate VI, 

 and not plate VII, as there printed. Line 17 from the bottom, same page, for 

 Abdomen about 40 in length, externus, read Abdomen about 38 in length. FBA- 

 TERNUS. 



4. In "Occasional Memoirs of the Chicago Entomological Society," Vol. I, 

 No. 1, March, 1900, pp. 17 and 18, Mr. .James Tough has described and figured 

 the appendages of the male of a very interesting species of Gomphus under the 

 name of Gomphus cornutus. The author's description is quoted. 



"Length, (^, 55-57mm. ; abdomen, 40-42mm. ; hind wing, 32-33mm. 



" Yellowish green, with black and brown markings. Face and occiput yel- 

 lowish green, eyes posteriorly black above, yellowish below, occiput distinctly 

 convex, notched in center and fringed with black hairs, vertex and antennae 

 black. Prothorax black, with a geminate spot in center and a patch on each side, 

 yellowish. Thorax yellowish green, except a narrow band, indistinct or absent 

 anteriorly, on each side of mid-dorsal carina, also except humeral and anti- 

 humeral bands, and margins of first and second lateral sutures, all of which are 

 brown. Legs black, front femora yellowish green below. Wings hyaline with 

 viens black, pterostigma yellowish, and costa yellowish green. Abdomen of uni- 

 form thickness, black, a dorsal stripe or spot on segments 1-8, small and basal on 

 8, and a small quadrangular spot on 10, yellowish; dorsum of 9 entirely black. 



"Superior appendages dull yellowish; seen from above, internal branches 

 produced inward and backward until they meet, acute and spinose at tip ; ex- 

 ternal branches short, rather broad, and tipped with a blunt spine. Inferior ap- 

 pendage, seen from above, slightly longer than superiors, spreading, the distance 

 from tip to tip of outer extremities being more than twice the width of the tenth 

 abdominal segment at base. From side view the internal branches of superiors 

 are seen to bear a conical tooth about midway between base and apex ; the inferior 

 curving upward gradually and each branch bearing a curved spine at tip. 



"Described from two male specimens, taken at Glen Ellyn, Du Page County, 

 Illinois, one June 14, 1897, the other May 30, 3898." 



Mr. Tough writes me that he thinks he has since taken the female of this 

 species. The occiput is high, rounded, and in front is a triangular pyramid, its 

 base bounded by the line between the vertex and occiput, and by lines drawn 



