DYTHEMIS.—BRECHMORHOGA. 277 
or reddish-brown, in having the abdomen tapering from segments 2 (3°38 mm.) to 10 (2 mm.), mid-dorsal 
longitudinal carina of 4-9 more widely black, especially on 8 and 9; appendages 15 mm. long, straight, 
simple, longer than segment 10, not so long as 9; vulvar lamina not reaching to the apex of 8, with an 
almost semicircular apical emargination about as wide as is the lamina (sternite of 8) itself ; legs luteous, 
tarsi darker, femoral armature as described for the males. 
3 Q. Front wings with one (14°/,) or two (86°/,) rows of cells between the subnodal sector and the 
supplementary sector next below, one submedian cross-vein, internal triangle 3-celled (4-celled in one 
wing out of 36), three post-triangular rows to at least the level of the nodus, 11-14 ante-, 7-10 post- 
cubitals. Hind wing with one (66-7 °/,) or two (33°3 °/,) rows of cells between subnodal sector and 
supplementary sector next below, one (25 °/,) or two (75 °/,) submedian cross-veins, two post-triangular 
rows increasing to three proximal to the level of origin of subnodal sector, 8-9 ante-, 8-10 postcubitals. 
The above-mentioned variations in venation are not geographical, and are not rarely asymmetrical in the 
same individual. The Cacao ¢ is not included in these statistics. 
Hab. Guatemata, San Isidro (Champion: 1 3), Gualan [3 ¢ ], Mazatenango [6 ¢ ] 
(Williamson, coll. ejusd.) (Hine, O.S. U.: 1 3; Maxon & Hay, U.S. N. M.: 13), 
Cacao in Alta Vera Paz (Barber, U.S. N. M.: 1 3 ).—Prrv (coll. R. Martin, teste Ris) ; 
Braziu [1 ¢ |, Chapada [4 ¢,1 9] (H. . Smith, Carn. Mus. Pittsb.), Espiritu Santo 
(coll. Martin, teste Ris). 
Taken at Gualan in January, at Mazatenango in February. Mr. Williamson made 
the following note at the latter locality, Feb. 3, 1905:—‘‘ On twigs over water along 
smaller and larger streams, in sunlight.” 
The nearest ally of this species is D. constricta, Calvert *, from Brazil, from the male 
of which it is separated by structural details of the appendages and genitalia, and the 
colouring of frons, vertex, and abdomen. 
As the proposed specific name suggests, this species has much the facies of a 
Cannacria. 
BRECHMORHOGA. 
Brechmorhoga, Kirby, Ann. & Mag. Nat. Hist. (6) xiv. p. 264 (1894) ’; Calvert, Proc. Bost. Soe. 
Nat. Hist. xxviii. pp. 301, 303, 304, 306, 312 (1898) ’. 
In establishing this genus Mr. Kirby gave ! as its chief differences from Macrothemis 
that the frontal tubercle [vertex] is bifid, and that the post-triangular space of the front 
wings “has a loop-nervure above, enclosing 7 or 8 cells, and is half as brodd again at 
the hind margin as at the triangle”; while, on the other hand, “ In Macrothemis the 
frontal tubercle is not bifid, the post-triangular space on the front wings has no loop- 
nervure, and the two rows of cells only increase close to the hind margin, where the 
space is scarcely, if at all, broader than at the triangle.” 
In spite of the much more extensive material before me now than in 1898, I still 
cannot see that the shape of the vertex is sufficiently distinct to be employed as a 
generic differential. I probably underestimated (/. c.?, p. 312) the constancy of the 
“ loop-nervure ” (which I would call the “ supplementary sector next below the short 
* Proc. Bost. Soc. Nat. Hist. xxviii. p. 311, t. 1. fig. 16 (genit. 3). 
BIOL. CENTR.-AMER., Neuropt., December 1906. IO 
