Occasional Papers of the Muscmn of Zoology 47 



Hctcragrion species. — In Dr. Calvert's material, collected by 

 himself, is a very teneral male taken at La Emilia, Costa Rica, 

 November 16, 1909. The species is distinct from anything 

 known to me though it is doubtless closely related to initra- 

 tiiin. The specimen is however so teneral that the form of 

 the appendages cannot be determined. Its most distinctive 

 character is the coloration of the head, in which it resembles 

 angnstipenne (figure 29), the vertex being black to the frons, 

 and to the same level on either side between the antenna and 

 the eye^ with a small indention of pale color posterior to each 

 antenna. The metathoric dark stripes are better developed 

 than in teneral specimens of mitratimi; the abdominal mark- 

 ings and wings are apparently identical in the two, though 

 the stigma may be slightly shorter in mitratuin. While it is 

 certainly an addition to the known Central American fauna, 

 more material is necessary for its description. 



26. Heteragrion simulatum, new species 

 Figures 48, 49, 70, 97, 98, 164, 165 



Abdomen, male 34 mm.; female 29: hind wing, male 21.5; 

 female 22.5. 



j\Iale. — Rear of head, genae, face, frons and vertex to level 

 of the median ocellus, bright yellow; remainder of vertex 

 black; small obscure brown areas on the genae and a small 

 brown spot on each side between the antenna and eye. First 

 two joints of antenna and basal half of third bright yellow, 

 remainder brown. Profile like figure 64. 



Prothorax bright yellow, front lobe with a median black 

 spot, and on either side, an indefinite dusky area ; middle lobe 

 with the merest trace of dusky on either side ; hind lobe with 

 a large rounded median black spot which encroaches on the 

 middle lobe but does not quite reach the posterior border; ex- 



