MICRATHYRIA. 925 
2. Micrathyria atra. (Tab. IX. figg. 13-15.) 
Dythemis atra, Martin, Ann. Soc. Ent. Fr. xvi. p. 590 (1897) *. 
¢. The male from San Felipe is evidently younger than that from Honduras or than M. Martin’s type’, and 
consequently shows some differences in colours, as follows :—Occiput reddish-yellow; dark colours of 
the thorax brown, which predominates on the dorsum but not on the sides, where it has some metallic 
reflection; mid-dorsal thoracic carina, a narrow transverse stripe in front of the ante-alar sinus and a 
narrow antehumeral stripe, which does not reach the transverse stripe, yellow; the transverse stripe is 
confluent at its outer end with the upper end of a yellowish humeral stripe; pale colour of the side of 
the thorax green, the pattern as shown in our figure; abdominal segments 1-7 pale reddish-brown, their 
longitudinal carine and the intersegmental sutures black, the pale colour on 7 with a more yellowish 
tinge than the others; 8-10 black, a pale basal spot on each side of 8; wings clear except for the tips 
smoky-brown proximad to not quite as far as the stigma, and some brownish-yellow in the extreme 
base of the submedian space of the hind wings, reaching out not halfway to the cross-vein. 
@. A female from Teapa seems to belong to this species on account of its size and venation. It differs 
from the San Felipe male in having less metallic blue on the frons and no brown at the wing-tips ; 
there is some pruinosity at the wing-bases. The sides of the thorax are too obscure to make out the 
colour-pattern, and I suspect that the abdomen attached to this specimen is really that of a species of 
Erythroduplax. 
Hab. tMexico, Teapa in Tabasco (H. H. Smith: 1 2); GuatTemata, San Felipe, 
Retalhuleu (Maxon & Hay, U. 8S. N. M.: 1 8); Honpuras (coll. Selys: 1 3).— 
- Brazit, Para (teste Ris in litt., 25. x. 1905), Minas Geraes }. 
Taken in February at San Felipe, in April at Teapa. 
The identification of this species has only been rendered possible by the kindness of 
Dr. F. Ris, who has studied the type of M. Martin, and has loaned me the Honduras 
male quoted. The structural characters of the San Felipe specimen agree perfectly. 
3. Micrathyria hagenii. (Tab. IX. figg. 16-18.) 
Micrathyria hagenii, Kirby, Cat. Odon. p. 41 (1890)"; Calvert, Proc. Calif. Acad. Sci. (2) iv. 
p. 540, t. 17. figg. 95-97 (details, ¢ 9) (1895)*; (3) Zool. i. p. 399 (1899) °; Carpenter, 
Journ. Inst. Jamaica, ii. p. 261 (1896) *; Kirby, Ann. & Mag. Nat. Hist. (7) ni. p. 368 
(1899) °. . 
Dythemis didyma (nec Selys), Hagen, Syn. Neur. N. Amer. p. 165 (1861)°. 
Dythemis dicrota (nee Hagen, 1861), Hagen, Proc. Bost. Soc. Nat. Hist. Xvili. p. 75 (1875) *. 
The extent of metallic blue on the upper surface of the frons is variable, but is not correlated with size, age, 
or the existence of 2 or of 3 cells immediately after the triangle on the front wings. 
Hagen ° called attention to the larger size of his Mexican specimens as compared with those from Cuba, but 
this does not appear to be always the case, to judge from the West-Indian examples before me: 
e. g., abdomen, ¢ 23 (Izamal), 22°5 mm. (Matamoros, Hayti); hind wing, ¢ 26:5 (Izamal), 29 mm. 
(Matamoros, Hayti). 
Hab. Unrrep Staves, Esperanza Ranch near Brownsville (Schaeffer, Mus. Brooklyn 
Inst. 1 3, 12) in Texas? (A. W. 8S.: 1 9); Lowsr Cauirornia, Mesa Verde?, 
Miraflores2, San José del Cabo? (Hisen, coll. P. P. C.: 93, 4 2).— Mexico, 
Matamoros® (M. C. Z.: 1 3,1 2) and Tampico® in Tamaulipas, Acaponeta*® and 
Tepic3, Izamal (Gaumer, Field Columb. Mus. Chicago: 2 3 ) and Tekanto? (A. N.S. 
