June, '03] ENTOMOLOGICAL NEWS. 



3 E. quadratics n. sp. 



Hab.S&n Isidro, Guatemala, i $ by Champion in coll. 

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



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



Hab. Cache in Costa Rica, 2 $ by H. Rogers in coll. God- 

 man. 



5. E. obtllSUS Selys, ll.ce. pp. 187 (1869), 757 (1873), 468 (1878). 

 Hab. Santo Paulo and Peba, Upper Amazons; Bogota. I 



have not seen this species. 



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



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

 S 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. 



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

 intervals for its whole length (absent \\-\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 m plagiatus y\.\ns stripe is hardly half as wide as the distance men- 

 tioned), the outer edge convex (concave or straight \\\. plagiatus) t conflu- 

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

 border (sometimes not confluent in 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 plagiafus. 



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 S-io chiefly black, 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 8-10 yellow (8-10 reddish brown in plagia(ns) ; tips of 

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

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



