June, '03] ENTOMOLOGICAL NEWS. I9I 



3. E. qnadracies n. sp. 



Hab. — San Isidro, Guatemala, i $ by Champion in coll. 

 Godman ; Chiriqui i <? , i (broken) 9 in coll. McLachlan. 



4. E. tnmefactus n. sp. (pi. viii, fig. 4). 



Hab. — Cache in Costa Rica, 2 <? by H. Rogers in coll. God- 

 man. 



5. E. Obtusus Selys, ll.cc. pp. 187 (1869), 757 (1873), 468 (1878). 

 //(2(^.— Santo Paulo and Peba, Upper Amazons; Bogota. I 



have not seen this species. 



6. E. snbobtnsus Selys, I.e. p. 467 (1878). (PI. viii, figs. 10, ir.) 



Hab. — Mexico, Guatemala, Costa Rica. I have studied 4 

 % I (broken) 9 in colls. Godman, U. S. Nat. Mus. 



III. On Gomphus olivaceus Selys. 



Among the Gomphinae loaned to me by Mr. McLachlan for 

 study in preparing the Biol. Cent. Am., I find the type of this 

 species. As olivaceus is apparently unknown to us in America 

 I give some figures from the type (see PI. viii, figs, i, 6, 8) and 

 the following statement of differences from G. plagiatus . 9 

 to which it was compared by Selys. 



9. Hind margin of occiput with about 13 black denticles at irregular 

 intervals for its whole length (absent \x\ plagiatus). 



Pale green antehumeral stripes wider {i e. each is about as wide at its 

 lower end as the distance from its inner edge to the mid-dorsal carina, 

 while '\n plagiatus '^\,\\\'=> stripe is hardly half as wide as the distance men- 

 tioned), the outer edge convex (concave or straight m plagiatus), conflu- 

 ent at lower (anterior) end with the green of the anterior mesothoracic 

 border (sometimes not confluent \n plagiatus)-, green humeral stripe rep- 

 resented by a narrow inferior streak and a superior round spot, hence 

 interrupted (not interrupted in plagiatus); no distinct brown stripes on 

 the lateral thoracic sutures as there are in plagiatus. 



Yellow dorsal band on abdomen more abruptly broader at bases of 2-7, 

 on 6 and 7 forming a transverse basal ring which is confluent with the 

 yellow of the inferior lateral surfaces, dark colors of the same segments 

 blacker than in plagiatus ; dorsum of 8-10 chiefly bla<:k, with a basal dor- 

 sal yellow spot half as long as the segment on 8 and 10 and one-third as 

 long as 9, sides of S-io yellow (8-10 reddish brown in plagiatus) ; tips of 

 the two lobes of the vulvar lamina much less acute ; pterostigma shorter, 

 4 mm. (4.5 mm. \n plagiatus) . 



