226 HYMENOPTERA. 



sides of the face densely covered with pale golden pile. Thorax : 

 the pro- and mesothorax above ferruginous and transversely 

 striated; the anterior margin of the mesothorax covered with 

 golden pile, a black stripe running down the middle ; the scu- 

 tellum and post-scutellum longitudinally striated, the metathorax 

 obliquely so ; the sides, beyond the enclosed space, finely ru- 

 gose ; the legs fusco-ferruginous, the anterior pair, the inter- 

 mediate tibiae, the articulations and beneath being of a brighter 

 red ; the wings fuscous and slightly iridescent. Abdomen thinly 

 covered with a fine cinereous pile, the joints of the petiole fer- 

 ruginous beneath. 



Hab. Guinea. (Coll. W. W. Saunders, Esq.) 



This insect closely resembles Ammophila tennis &nd.Beniniensis, 

 for either of which it might, without an examination of the neu- 

 ration of the wings, be easily mistaken. 



Genus 4. TRIGONOPSIS. 

 Trigonopsis, Perty, Del An. Art. p. 142 (1830-4). 



1. TRIGONOPSIS RUFIVENTRIS. PI. VI. fig. 1. 



Podium rufiventre, Fabr. Syst. Piez. 184. 2. 



Trigonopsis abdominalis, Perty, Del. An. Art. p. 142. t. 2/. f. 17. 



Hab. ? 



This insect appears to be the Podium rufiventre of Fabricius ; 

 the large depressed head, the large eyes, and above all the white 

 scutellum, are described in the Sy sterna Piezatorum ; the latter 

 is not strictly correct, the white being a patch of silvery pubes- 

 cence beneath the scutellum. 



2. TRIGONOPSIS AFFINIS. B.M. 

 Trigonopsis affinis, Smith, Ann. $ Mag. Nat. Hist. vii. 31 (1851). 

 Hab. Brazil (Para). 



This species differs from T. rufiventris in having the head less 

 depressed, the prothorax much shorter and less attenuated, the 

 metathorax transversely striated, and the anterior and interme- 

 diate tibiae and tarsi ferruginous. 



3. TRIGONOPSIS VIOLACEUS. B.M. 



Trigonopsis violaceus, Smith, Ann. 8f Mag. Nat. Hist. vii. 31 



(1851). 



Hab. Brazil (Para). 



