336 COSTA RICAN EPIGOMPHUS (oDONATa) 



the remainder of the segment brown; eight to ten blackish brown with a 

 variable extent of yellow on the sides inferiorly. 



9 . Vulvar lamina .91 to .98 mm. long, reaching to .44 to .54 of the length 

 of the lateral margin of segment nine, bilobed in the distal .54 to .58 of its 

 length, interval between the lobes triangular. 



Abdomen, c^, 40 to 42, 9 , 44 to 47; hind wing, d", 34.5 to 36, 9 , 38 to 39 

 mm. 



Epigomphus verticicornis 



Epigomphus verticicornis Calvert, Biol. Cent.-Amer., Neur., p. 410. 1908. 



The foUomng notes are based on the type cf and allotype 9 listed antea, 

 page 326: 



Pale color on the dorsal surface of the frons narrowly (c?) or widely (9) 

 separated into two spots, right and left. 



Metepimeron with a brown stripe near the ventral margin, but not reach- 

 ing the entire length of the sclerite, parallel to, but separated from, the brown 

 stripe on the second lateral suture by pale green of more than its own width. 



Abdominal segment two faded in the cf , with a narrow, mid-dorsal, yellow 

 stripe reaching to the transverse anteapical denticles and bordered with 

 brown on each side ( 9 ) ; three to four with a mid-dorsal, longitudinal, 

 yellow line and yellowish laterally for much of their length, confluent in the 

 9 with the dorsal yellow at the base of three but not on four; five and six 

 faded in the cT , in the 9 with a small, basal, mid-dorsal, yellow spot and the 

 sides yellow in the basal third, not confluent with the dorsal yellow: seven 

 faded, yellowish on the anterior five-sixths (d^) or half (or more? 9 ), blackish 

 in the remainder; eight to ten blackish with ill-defined yellowish or reddish- 

 yellow on the sides (cf, but not 9)- 



Epigomphus subobtusus 



Epigomphus subobtusus Selys, Bull. Acad. Roy. Belg. (2), xlvi, p. 467, 

 1878. Quatriemes Addit. Syn. Gomph, p. 62, 1878. Calvert, Ent. News, xiv, 

 pp. 189, 190, 191, pi. viii. figs. 10, 11 (3rd tibia d'), 1903; Biol. Cent.-Amer., 

 Neur., pp. 171, 172, 399, tab. vii, fig. 37 (occiput 9 ), tab. viii, figs. 8, 9 

 (apps. c?), 1905, 1907; A Year of Costa Rican Nat. Hist., pp. 149, 207, 1917. 

 Ris, Archiv f. Naturgesch., 82 Jahrg., Abteil A, 9 Heft, pp. 146, 147, 150, 

 1918. Calvert, Ent. News, xxx, p. 36, 1919. 



In the book of 1917 above cited we have referred to the case of 

 mimicry observed at Quebrada Honda, Costa Rica, between this 

 species and Brechmorhoga rapax crocosema. Following is a fuller 

 statement of the observation from my field note book. 



On August 1, 1909, at a small stream, descending from woods 

 high a])ove the raih-oad ti'acks })y a series of cascades through 

 steep fields of garUc (or onions), beets, manihot, etc., and passing 

 under the tracks west of the l)ridge over the Queliiada Honda 



