11- M'lD.K. 



1. Tetralonia melectoides. 



Male. Length 7 linos. — IJlack, shiiiinjjf; abdomen with white spots 

 at the apex. The clj'peus yellow, the niandiblcs ferruginous be- 

 fore the apex ; the face with a thin white pubescence, that on the 

 cheeks more dense and white ; the antenna) obscurely fulvous 

 beiuvith. The meaothorax and scutellura punctured, the former 

 with a little pale pubescence anteriorly; on tlie metathorax it 

 is whitish ; wings hyaline, the ncrvures blackish brown ; the 

 intermediate and posterior legs with black pubescence above, the 

 tarsi and tibiaj of the former with a mixture of snow-white, the 

 posterior tibiiX) at their apex and the tarsi with white pubescence. 

 Abdomen nigro-aeneous, finely punctured, most strongly so at the 

 base ; the apical margins of the third, fourth, and fifth segments 

 laterally with a short marginal fascia of white pubescence, shortest 

 on the third segment. 



Hab. Villa Nova, on the Amazon. 



5. Tetralonia fervens. 



Female. Length 6 lines. — Black, with the antennoc, except the 

 three basal joints, bright red. The face, labrum, and cheeks with 

 white pubescence ; the clypeus closely punctui-ed, truncate, and 

 having anteriorly a short carina in the middle. Thorax densely 

 clothed above with fulvous pubescence ; wings subhyaline, the 

 nervures dark ferruginous, the tegulse pale rufo-testaceous ; the 

 legs obscurely rufo-piceous beneath, the posterior legs with black 

 pubescence ; the apical joints of the tarsi ferruginous. Abdomen 

 shining ; the base of the first segment with fulvous pubescence ; the 

 base of the second segment laterally with a little white tomeutum ; 

 the third, fourth, and fifth segments have in the middle of the 

 segments laterally a narrow short fascia of white pubescence ; the 

 fifth and sixth segments with black pubescence, the latter with a 

 central angular naked space. 



Male. Eather smaller than the female, which it closely resembles ; 

 but has the clypeus and labrum yellow, the pubescence on the 

 legs entirely pale, and the fasciae on the abdomen longer, that on 

 the third and fourth segments being only slightly interrupted. 



Hab. Mendoza and Santiago. 



6. Tetralonia decorata. 



Female. Length 5| lines. — Head and thorax black, legs and abdo- 

 men pale ferruginous. The anterior margin of the clypeus, and 

 the labrum and mandibles, pale yellowish-white, the latter ferru- 

 ginous at their apex ; the antennae, except the three basal joints, 

 rufo-fulvous, fuscous above. The thorax clothed with pale fulvous 

 pubescence ; wings flavo-hyaline, the nervures ferruginous, tegute 



