242 Annals of the Carnegie Museum. 



Dimensions : Abdomen $ 33, ? ?; hind wing c? 23-26, 9 25 mm. 



Habitat : — Brazil, Cuyaba, 1 cP (head lacking); Corumba, May, 

 1 9 (abd. segs. 6-10 lacking). 



Bolivia, Piedra Blanca, April, 1 c? (abd. segs. 6-10 lacking). 



Argentina, Goya, east side of the Rio Parana, December 22, 1 <j\ 



All four specimens by H. H. Smith. Carnegie Museum, Pittsburgh. 



The Goya male is the type of the species. The Piedra Blanca male 

 is the smallest of its sex. 



The specific name proposed refers to the very characteristic, almost 

 horizontal, pale green band of the sides of the thorax. 



160. Micrathyria macrocercis sp. nov. 

 (Plate VII, fig. 136.) 



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

 black. Clypeus and frons pale green, the latter with a small superior 

 triangular brown spot, with metallic-blue reflections in front of the 

 median ocellus. Vertex metallic-blue. Occiput and rear of head 

 shining black, the former with two small pale green posterior spots. 



Thoracic dorsum dark metallic-green-brown, the dark mid-dorsal 

 carina bordered on each side with a pale green stripe, one-fifth as wide 

 as the mesepisternum on which it lies, and confluent above with a nar- 

 rower transverse stripe in front of each antealar sinus; a minute iso- 

 lated antehumeral green line on the center of the sclerite. Sides of 

 the thorax pale green, a short stripe on the upper halves of the mese- 

 pimeron, metepisternum, and second lateral thoracic suture, a spot 

 above the nietastigma, one on the lower ends of the mesepimeron and 

 of the metepimeron, blackish. 



Abdomen of the usual shape, blackish, 2-7 with a stripe on each side 

 nearly as long as each segment (except on 2) and half as wide as the 

 side of the dorsum on which it lies, pale green on 2 and 3, almost 

 orange on 4-7. 



Superior appendages (1.8 mm.) almost as long as 8 + 9, longer 

 than 9 + 10, very slender, in dorsal view almost straight, pale green 

 in the middle, brown at both ends, slightly thickened at two-fifths' 

 length, thence gradually tapering to the very acute apices ; in profile 

 view gently curved downward, so that the upper margin is concave, but 

 the extreme apex more strongly decurved ; inferior surface at two-fifths' 

 length with a slight tooth, between which and the base are 5-6 

 denticles. 



I 



