94 ACADEMY OF NATURAL SCIENCES 



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

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

 the lateral angles, which have not the slightest appearance of 

 rugosity. 



(^A Platynus of the division Agonum, which I have thus far 

 failed to identify. — -Lec.] 



4. F. SCUTELLARIS. — Black; posterior thoracic angles rounded ; 

 region of the scutel much impressed. 



Length two-fifths of an inch. . [1^7] 



Body depressed, black, immaculate ; antennas black ; thorax 

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

 so as to resemble large impressed spots ; lateral edge regularly 

 arquated, not exeurved 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. F. 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 exeurved 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 Platynus. — Leg.] 



6. F. CONSTRICTA. — Apterous, blaek ; thorax much contracted 

 behind ; elytra with punctured striae. 



Length half an inch. 



Body apterous, black ; antennse 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 exeurved 



[Vol. IIL 



