OF AMERICA NORTH OF MEXICO. 327 



STRANGALIA, Serv. 



Caput pone oculos subito valde constrictum. 

 Palpi parum dilatati, recte truncati, labiales non latiores. 

 Antenna3 ll-articulato, vel filiformes, vel vix serratae. 

 Thorax angulis posticis productis. 



As thus defined, this group will contain many Pachyta of authors, and the greater 

 part of Serville's genus Grammoptera. That the labor of determining the species 

 might be lessened, I have endeavored to arrange them according to their affinities 

 into the following sections. 



A. Thoracis angulis posticis acutis. 



1 . Corpus attenuatum, thorace apice tubulato, constrictoque, basi impresso. Sp. 1 — 3. 



2. Thorace postice impresso, angulis non deflexis, elytris triangularibus, apice emarginatis fronte 



triangulariter impressa. Sp. 4 — 7. 



3. Corpus valde attenuatum, thorace baud impresso, angulis non deflexis, elytris dehiscentibus, apice 



excisis. Sp. 8 — 15. 



4. Corpus angustum lineare, elytris lineolatis, tryncatis, grosse punctatis. Sp. 16 — 17. 



5. Elytris parallelis, concoloribus, grosse punctatis, thorace baud impresso : corpus minus angustatum. 



Sp. 18—24. 



6. Elytris dehiscentibus, grosse punctatis thorace postice profunde impresso. Sp. 25. 



7. Thorace convexo, elytris triangularibus, maculatis, fronte ad apicem baud impressa. Sp. 26 — 30. 



B. Thoracis angulis posticis laminatim productis. Sp. 31 — 32. 



A.— 1. 



1. S. scALARis. — Valde elongata, picea, dense subtiliter rugose-punctata, pubescens, thorace longiusculo, 



antrorsum angustato, utrinque constricto, canaliculato, lateribus subsinuatis, elytris medio coarctatis, 

 apice dehiscentibus, rotundatisque, macula communi subsellata, ad medium flavo-pubescente, palpis 

 antennisque rufis. Long. -95. 

 Lepiura scalaris, Say. J. A. N. S. 5, 278. 



Found at Saratoga, and given to me by Mr. James Thomson. 



2. S. coARCTATA Valde elongata, picea, dense subtiliter rugose-punctata, pubescens, thorace campanulato, 



utrinque subconstricto, elytris medio coarctatis, basi rufescentibus, apice dehiscentibus, rotundatisque, 

 abdomine rufescente. Long. 8 lin. lat. 2. 

 Toxotus coardaius, Hald. 59 : Dej. Cat. 



Pennsylvania. Mus. Mels. Very similar to the preceding, but the thorax is bell- 

 shaped and rounded on the sides. 



83 



