240 Annals of the Carnegie Museum. 



3 labeled " Beschke" and " gerula." Museum of Comparative 

 Zoology, Cambridge, Mass. These latter two are doubtless the 

 Dythemis gerula from Nova Friburgo, Brazil, of Hagen's List of South 

 American Neuroptera in his Synopsis of 1861, page 317. They are 

 younger than the other males, and have an orange spot on each side 

 of the dorsum of abdominal segment 7, each spot about three-fifths as 

 long and half as wide as the side on which it lies. 



159. Micrathyria longifasciata sp. nov. 



d\ Lips yellow, mesial margins of lateral labial lobes narrowly 

 black. Clypeus and frons pale green, the latter metallic-blue above 

 only in the center in front of the median ocellus for a width of 1 

 mm. Vertex metallic-blue. Occiput and rear of head shining black, 

 a small yellow spot and streak behind each eye. 



Thorax brown, or dull metallic-blue or -green obscured by some 

 pruinosity, the following pale green : a narrow stripe on each side of, 

 and close to, the upper half of the mid-dorsal carina, confluent above 

 (or not confluent — Piedra Blanca) with a narrow transverse stripe in 

 front of the antealar sinus ; a narrow isolated antehumeral stripe oc- 

 cupying the middle third of the length of the mesepisternum (absent 

 in the Piedra Blanca 3) ', a nearly horizontal band, extending from 

 the lower part of the mesepisternum and the mesinfraepisternum to 

 the base of the abdomen ; the average width of this band is slightly 

 more than 1 mm., its upper edge is markedly zigzag with five points 

 or " peaks " ; pectus. Thorax and rear of the head with many pale 

 hairs. 



Abdomen narrowed to the anterior end of 4, thence widened to the 

 hind end of 7 (2.5 mm.), thence narrowed to 10 ; black, pruinose at 

 base, on 4 and 5 (and perhaps also 3 in earlier life) ; each side of dorsum 

 with a linear yellowish spot at base and a yellowish longitudinal line after 

 the transverse accessory suture (the line absent from 5 in the Piedra 

 Blanca c?) ; 7 with a yellowish spot on each side of dorsum, each spot 

 three-fifths as long and three-fifths as wide as the side on which it lies, 

 and separated from its fellow of the opposite side by the black mid- 

 dorsal carina only. 



Superior appendages a little longer than the mid-dorsal length of 9, 

 brown in the proximal three-fifths, pale (green?) in the distal two- 

 fifths, slender, in dorsal view slightly thickened at base and at two- 

 thirds' length, apex acute \ in profile view curved gently downward, 



