532 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



9. Thorax short, scutellum separated from mesonotum by a 



deep furrow 10 



Thorax more elongate, scutellum not separated by a deep 

 furrow 11 



10. Face with a distinct keel between antennae 



Eritrissomerus p. 534 

 Face not keeled Polygnotus p. 535 



11. Lateral ocelli nearer to eye margin than to anterior ocellus 



Platygaster p. 540 

 Lateral ocelli nearer to front ocellus than to eye margin 



Isocybus p. 541 



Isostasius Foerster. 

 I. musculus Ash mead. 



Black, shining. Antennas piceous or dark brown. Legs 

 brown, coxae black, trochanters, base and apex of femora, tibiae, 

 and all tarsi honey-yellow. Thorax with hardly a trace of fur- 

 rows. Length 1.2 mm. 



Inostemma Haliday. 

 I. horni Ashmead. 



Black, subopaque, closely finely punctulate ; mesonotum shin- 

 ing. Antennae black, the pedicel and first two funicular joints 

 a little pale at tip. Parapsidal furrows complete. Legs black 01 

 piceous, tarsi yellowish, and tibiae paler basally. Abdomen in 

 female at base with a horn extending over the thorax to the 

 vertex of the head. Male without horn. Length 1-1.4 mm. 



A parasite of a Cecidomyid forming galls on the iron-weed 

 ( Vernonia noveboracensis) . 



Amblyaspis* Foerster. 

 Key to Species. 



1. Scutellum produced into an acute spine minutus 



Scutellum triangular or with a tubercle at apex 2 



2. Abdominal petiole, legs, and base of antennae pale yellow 



petiolatus 



Antennae dark brown 2 



Antennae, except club of female, bright yellow flavicornis 



3. Abdomen broadly oval, shorter than thorax breviventria 



Abdomen long-oval, longer than head and thorax together 



antennariae 

 A. minutus Ashmead. 



Polished black, impunctate. Antennae and legs yellow 01 

 reddish yellow. Scutellum acutely spined, yellow at tip, foveated 



See note on p. 531. 



