94 ACADEMY OF NATURAL SCIENCt:S 



to be distinct by the spots on the vertex, the somewhat differently 

 formed thorax, and by the perfect smoothness of the cavities of 

 the lateral angles, -which have not the slightest appearance of 

 rugosity. 



[A Plati/nua of the division Agonum, which I have thus far 

 failed to identify. — 'Leg.] 



4. F. scuTELLARis. — Blackj posterior thoracic angles rounded ; 

 region of the scutel much impressed. 



Length two-fifths of an inch. - [147] 



Body depressed, black, immaculate ; antennae black ; thorax 

 with a narrow margin; dorsal line distinct; basal lines dilated, 

 so as to resemble large impressed spots ; lateral edge regularly 

 arquated, not excurved behind ; basal angles rounded : elytra, 

 obsoletely punctured ; interstitial lines a little convex ; region 

 of the scutel much impressed ; humerus gibbous ; coxae and tarsi 

 piceous. 



5. r. ERRANS. — Green, polished; beneath black : feet, base of 

 the antennae, of the palpi rufous. 



Body above polished green : labrum dark reddish-purple : an- 

 tennae fuscous, basal joint rufous; palpi fuscous; thorax obvi- 

 ously wider than long ; dorsal line distinct ; basal lines much di- 

 lated and with a few punctures : an obvious narrow margin, and 

 reflected edge ; lateral edge not excurved behind ; posterior an- 

 gles rounded ; base much wider than the petiole : elytra with a 

 very slight reddish reflection ; striae very narrow, impunctured ; 

 interstitial lines flat : beneath black : feet rufous. 



This species rembles F. nutans Say, but may be distinguished 

 by a shorter thorax, which is margined and at base wider. 



[Also a Plati/nus. — Leg.] 



6. F. CONSTRICTA. — Aptcrous, black ; thorax much contracted 

 behind ; elytra with punctured striae. 



Length half an inch. 



Body apterous, black ; antennae fuscous, piceous at base; la- 

 brum and palpi piceous : mandibles striated obliquely : thorax 

 convex, wider than long, rather abruptly contracted at the pos- 

 terior margin, [148] which is depressed; dorsal, basal, and ante- 

 rior lines distinct, impunctured, the former attaining the base; 

 basal lines double ; lateral edge much rounded, abruptly excurved 



[Vol. III. 



