154 DESCRIPTIONS OP NEW SPECIES. 



Three males; New York and Missouri. Quite different from 

 M. dimidiata, in form and sculpture. The scutellar lobe is 

 rounded at tip, and suddenly elevated near the tip into a short 

 horn, which is truncate or feebly emarginate at its apex.* 



RHIPIPHORIJS FABR. 



451. R. linearis. Elongatus, niger nitidus, capite thorace paulo 

 latiore laevi convexo, thorace latitudine plus sesqui longiore, postice 

 sensim paulo ampliato, lobo postico elongato, subacuto piano, disco 

 haud dense punctate, ad basin utrinque longius vage impresso ; elytris 

 punctatis, longitudinaliter impressis, apice divergentibus acutis ; tarsis 

 antennisque fuscis, his basi testaceis. Long. '15. 



One male, from Kentucky, given me by Mr. J. Ph. Wild. 



* The following forms were received too late for insertion in the List : 

 M. a Ixlom i ualis. Atra confertim punctata, subnitida, capite sat dense 

 punctate, vertice paulo concavo apice subemarginato, thorace latitudine 

 paulo longiore, lobo postico apice rotundato, disco ante scutellurn elevato, 

 fere cornuto, cornu apice rotundato ; elytris fere a basi divaricatis, sen- 

 sim attenuatis, apice acutis, fortius punctatis pallidis, margine basali 

 dimidioque postico nigris, abdomine sanguineo ; auteunis piceis, basi 

 pallidioribus. Long.. '30 -40. 



Middle States. I owe to Mr. J. H. B. Bland the privilege of examining 

 six females of this species. It differs from M. flavipennis chiefly in color ; 

 the posterior half of each elytron is black, but the line of demarcation is 

 an angle directed forwards, so that at the suture and side margin the pale 

 color extends farther than at the middle. It is Eh. abdominalis Dej. Cat. 



M. marginalia. Atra confertim punctata, subnitida, capite parce 

 subtilius punctate, vertice convexo haud emarginato, thorace latitudine 

 haud sesqui longiore, lobo postico apice emarginato, ante scutellura 

 modice elevato ; elytris pone medium divaricatis, parce punctatis, sensim 

 attenuatis, apice acutis, pallidis margine basali sutura, limbo externo 

 pone medium, apiceque nigris ; antennis testaceis. Long. -36. 

 One male specimen, from Philadelphia, in the collection of Mr. Bland. 

 This species seems to bear the same relation to M. dimidiata that M. flavi- 

 pennis does to the preceding. It differs merely in color ; the antennae are 

 testaceous, and the elytra margined with black behind the middle, and at 

 the tip, the black of the latter extending for about one-fifth of the length. 

 Gerstsecker has described (Mon. Rhipiphoridum, 21) both sexes of M. 

 dimidiata as having >the antennae black with the base testaceous, and it 

 is solely in deference to this observation that I have described the two 

 species in this note. Otherwise, I would be tempted to regard M. abdomi- 

 nalis as the female of M. flavipennis, and M. marginalis as the male of 

 M. dimidiata. 



