392 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3 d Ser. 



bifid, and in the greater width of the post-triangular field of 

 the front wings — the number of rows increasing to more 

 than two from, usually, the level of the point of separation 

 of the median and principal sectors. To Brechmorhoga 

 belong mendax Hag. , prcecox Hag. , -pertinax Hag. , nubec- 

 ula Ramb., and probably Sallaii Selys; I have studied the 

 types of the first three and hope soon to publish a synopsis 

 of the differences of all these closely related species. 1 



28. Brechmorhoga postlobata Calvert. 

 Plate XXV, Fig. 12. 



Brechmorhoga postlobata Calvert, Proc. Bost. Soc. Nat. Hist., Vol. 

 XXVIII, 1898, p. 314 (very brief diagnosis). 



Male. Colors somewhat faded. Face pale brown, vertex and superior part 

 of frons dark metallic blue-green. Lips yellowish, labrum with a median 

 spot and the middle of the free margin brown, median lobe and inner third 

 of lateral lobes of labium brown. Occiput and rear of head brown, two or 

 three pale spots behind the eyes. 



Prothorax light brown. Thoracic dorsum dark brown, a green antehu- 

 meral stripe widened abruptly on its inner side at its upper end; sides pale 

 green with two ill defined, oblique, brown stripes, one on the site of the 

 lower half of the first lateral suture, the other on the second lateral suture. 

 Legs blackish, bases of all femora and the first pair inferiorly pale brownish. 



Abdomen compressed at base, slender at base of 4, thence widening to 

 the base of 8, and thence narrowing to apex; black, dorsum of 2-5 with a 

 narrow, pale brown stripe each side, reduced to a pair of basal dots on 6 and 

 on 8, greatly widened and almost as long as the segment on 7; ventral sur- 

 face of 1-9 with a pale brown streak each side. 



Superior appendages slightly longer than 9, directed downwards and 

 inwards in the apical half, somewhat thicker before the apex, with an inferior 

 row of about nine denticles in the third and fourth fifths of their length, apex 

 moderately acute. Inferior appendage very little (about one-tenth) shorter 

 than the superior appendages, triangular, apex truncated, terminating in 

 two denticles directed upwards, which reach beyond the denticles of the 

 superiors. 



Genitalia of 2: anterior lamina entire, projecting equally with the genital 

 lobe. Hamule projecting still farther, not bifid, sickle-shaped, apex acute. 

 Genital lobe oblong, peculiar in having a posterior basal tubercle (wanting in 

 all other species of this genus), apex of lobe itself and of this tubercle hairy. 



Wings with a faint yellowish tinge, extreme base darker yellow for the 



1 This synopsis was written subsequent to the preparation of the present paper, but 

 published before it in Proc. Bost. Soc. Nat. Hist., Vol. XXVIII, 1898, pp. 301-332, 2 pis., 

 under the title of " The Odonate genus Macrothemis and its allies." 



