DECAMEEIA. 65 



2. Decameria rufiventris. 



Nigra, subviolacea, abdomine flavo-rufo ; alis fuliginosis, cellula cubitali tertia duplo longiore quam secunda. 



$ abdomine supra nigro ; alis cellula cubitali tertia haud duplo longiore quam secunda. 

 Long. 10 millim. 



Hab. Costa Rica, Irazu, 6000 to 7000 feet (Bogers). 



The head is nearly on a line with the eyes behind. The sutures on the vertex 

 are deep and broad, and go down to near the antennae ; there is a distinct trans- 

 verse furrow behind the ocelli and a longitudinal one in the centre of the vertex ; 

 the frontal area is deeply sunk, the depression extending from the ocelli to the 

 antennae. The antennae are not much longer than the head and thorax, and shorter 

 than the abdomen, slightly pilose ; the third joint more than double the length of the 

 fourth. The second cubital cellule is a little longer than the first, and has a large 

 horny point beyond the middle, and is curved down where the recurrent nervure is 

 received at the apical third. The third cellule is more than double the length of 

 the second ; the recurrent nervure is received close to the second transverse cubital 

 nervure, which is not received in an acute angle ; the basal nervure is interstitial, is 

 straight, and not parallel with the first recurrent, which curves towards the base of 

 the wing much more than the second recurrent ; the transverse median nervure 

 is short, and is received in an acute angle formed by the costal nervure ; the median 

 cellule is five-angled. The stigma is long ; the appendicular cellule large ; costa 

 thickened. The spines are short, thick, broad; the patellae are present, although 

 small ; the spurs simple. The anterior tarsi are very much longer than the tibiae ; 

 the posterior scarcely so lengthened. 



The male has the abdomen entirely black above ; the sutures on the vertex are 

 scarcely so deep, but the transverse and longitudinal furrows are present; the third 

 cubital cellule is shorter, not being double the length of the second, and the third 

 joint of the antennae is shorter in proportion to the fourth. 



3. Decameria nigriventris, (Tab. ill. figg. 9, $ ; 9 a, antenna.) 



Nigra ; capite, prothorace, mesothorace tegulisque rufo-testaceis ; alis fuliginosis, cellula cubitali tertia duplo 



longiore quam secunda. 

 Long. 8-9 millim. 



Hab. Panama, Volcan de Chiriqui 2000 to 3000 feet (Champion). 



The antennae are sparsely pilose; the third joint scarcely double the length of fourth, 

 the last longer than preceding, and, if any thing, longer than the fourth. The third 

 cubital cellule is double the length of second. The anterior coxae and knees are pale red. 



This species is smaller than D. rufiventris. The head is narrower, and retreats 

 considerably behind the eyes ; the frontal area is not altogether hollowed, there being 

 only a furrow proceeding from the ocellus ; the thrid joint of the antennae is shorter ; 

 the second cubital cellule is narrower, the third longer and consequently the fourth is 

 shorter. 



biol. cente.-amee., Hymenopt., December 1883. kk 



