428 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



structures strictly analogous to those of the other species in the 

 family. 



The pronotum is simple. The mesonotum is simple, with small 

 lateral basal pieces. Metanotum has the praescutum raised to the 

 level of the remainder of the metathorax and slightly angulate be- 

 hind. The scuti are narrowly separated by the scutellum. The 

 postlumbian is very large and the postscutellum relatively small. 

 At the side of postscutellum are two small pleurotergite areas, the 

 lower of which was called epimeron by Hofeneder. The prelare is a 

 large piece and was considered part of episternum by Hofeneder. 

 Episternum is longitudinally divided, but only the lower lobe or 

 lateropleurite w^as recognized as episternum by Hofeneder. The 

 pleural suture extends to the coxae. The epimeron is a large strip 

 from wing to coxa, the front part of which was called parapleuroii 

 by Hofeneder, and in his figure " 6a " the part labeled " st.^^ is the 

 hypoepimeron. Hofeneder figures the little triangular piece on 

 epimeron, which the writer considers a detached piece of scutellum, 

 to which the axillary cord is attached, as described under Triozocera. 



The prosternum has a tiny eustemum and a transverse sternellum, 

 biemarginate, with the coxae attached at the outer angles of the 

 emargination. 



The mesosternum has a transverse presternum and a transverse 

 eusternum, which is fused with episternum. The sternellum is as in 

 the prothorax. 



The metasternum is large and not divided transversely, but with 

 the usual longitudinal division of the sternellar area. The epimeron 

 extends as a postcoxale behind the coxae. The coxa is a very large 

 lobate area bearing the trochanter. 



4. Genus AUSTROSTYLOPS Lea. 



Piute 66, fig. 5. 



Lea's figure of Austrostylops gracilis is so poor that it is impossible 

 to interpret adequately the thoracic scelerites. The writer has made 

 a drawing in which a slight interpretation of Lea's original is added. 



5. TETROZOCERA, new genus. 



Type of the genus. — Tetrozocera sanfchii, new species. 



Name derived from rerpa (four) + 6^os (branch) + /ceoas. 

 (horn) = four branched antennae. 



Male. — Head transverse; eyes large, prominent, with many large 

 facets. Mandibles large, flattened, triangular; maxillae two-jointed, 

 elongate. Antennae six-jointed, sensitive, with the third, fourth, 

 and fifth joints laterally produced and the sixth elongate. Prothorax 

 and metathorax transverse. Elytra subclavate. Metathorax very 



