60 burmeister's ODONATA. 



of the prolhorax of Daaythenm is said to be moderately large, 

 heart shaped. 



That these ditferences are not important — unless it be that as re- 

 gards the prothorax — is shown by the fact that a male in the Mas. 

 Comp. Zool., with the printed label " Mus. Berol." and the written 

 label " liriope Bresil" in Hagen's handwriting, agreeing in all other 

 particulars with Dcm/themis liriopa Karsch (/. c. p. 252) shows the 

 same differences from the generic description of Dasythemis as does 

 the above described venosa $ . This % llrlope is the species quoted 

 by Hagen, without description, as Dythemla liriope Hagen in Syn. 

 Neur. N. Araer. p. 317, 1861, and Proc. Bost. Soc. Nat. Hist, xviii, 

 p. 87, 1875. It seems to have preserved its colors better than the 

 individuals described by Dr. Karsch. A description of thorax and 

 abdomen is therefore added. 



Dasytlieniis liriopa Karsch % . Thoracic dorsum dark reddish brown, 

 a narrow antehumeral stripe, not reaching upward more than half way to the 

 wing-base, and a sinuous humeral line, greenish yellow. The reddish brown 

 following this humeral line reaches half way to the spiracle and is followed by 

 an oblique, yellowish band whose posterior edge almost reaches the spiracle, 

 metepisteruuni brown, metepinieron and pectus pale obscure greenish. Wing 

 bases and iuteralar pieces pruiuose. Abdominal segments 1 and 2 pruinose above> 

 yellowish beneath ; 3-8 red above, with the articulations and the apex on either 

 side black; 9 and 10 black. Superior appendages black, as long as 9, curved 

 downward in the basal half, slightly upward in the apical half, in the third fourth 

 with an inferior row of 4 denticles, apex acute. Inferior a})pendage black, about 

 one-fifth shorter, apex blunt, ending in the usual two upturned denticles. 



Another % in the M. C. Z., marked "Rio Janeiro", is also of this species; the 

 genitalia of the second abdominal segment are more easily examined in this in- 

 dividual. Except when the penis is protruded, as is the case with the preceding 

 %, the genitalia cannot be called "stark vorragend". The hamule is slightly 

 more prominent, is bifid, the inner branch the more slender : anterior lamina 

 inconspicuous, entire; genital lobe widened and rounded at the tip. 



Abdomen 22 23 mm., hind wing 25-26, pterostigma 2.75-3. 



I>. liriopa? J . A female in the M. C Z. from Winthem's collection and 

 marked "Bahia" may be the other sex of liriopa. It seems to be not fully col- 

 ored, the markings of head and thorax being as described for the % but paler 

 throughout; the metallic blue of the frons being barely suggested. Abdominal 

 segments 1-3 luteous. 3 with a dark brown spot each side at apex ; 4-8 with a 

 wide, dark brown stripe each side from base to apex, leaving a narrow, middle 

 stripe and a spot each side luteous; 9 and 10 dark brown ; 10 prolonged backward 

 so as to he four times longer ventrally than dorsally ; sternum of 9 likewise pro- 

 duced backward, terminating in a free rounded margin provided with a trans, 

 verse row of bristles. Vulvar lamina not produced nor bilobed A pair of 

 slender, ventral palp-like organs on 9. Appendages of 10 similar to those of 

 venosa. Wings smoky yellowish throughout, more intense at the bases and along 

 the anterior margins, pale brownish just below the nodus, and somewhat darker 



