AMERICAN COLEOPTERA. 



169 



Tribe XLIII.— Zacotini. 

 Antenna filiform arisine; under a slight frontal margin, first joint stouter, 

 cylindrical, third a little longer than the following, the first four joints glabrous. 

 Head subquadrangular, slightly constricted at a distance behind the eyes, a distinct 

 temporal cicatrix, front with one supra-orbital seta, clypeus slightly prolonged and 

 with the usual setigerous puncture each side. Eyes round, moderately prominent 

 and distant from the buccal fissure beneath. Labrum transverse feebly emargin- 

 ate, sexsetose in front. Mandibles not prominent, arcuate at tip only, acute and 

 without setigerous puncture externally. Maxillse eiliate within, hooked at tip, 

 the outer lobe rather stout, biarticulate ; palpi stout, the last joint shorter than the 

 preceding, oval and truncate at tip. Mentum transverse, emarginate and acutely 

 toothed, the epilobes acute and prominent; ligula moderately prominent, tip 

 arcuate and free with two setre, paraglossfe free for a short distance at tip which 

 is acute, shorter than the ligula; palpi moderate, third' joint elongate-triangular, 

 slightly arcuate, truncate at tip, the preceding joint shorter and bisetose in front. 

 Thorax ovate, slightly constricted behind, margin distinct, two lateral setse, one 

 near the middle, one' in front of base. Body pedunculate, scutellum not visible. 

 Elytra oblong-oval, humeri rounded, base not margined, sides narrowly inflexed, 

 margin entire not interrupted posteriorly without internal plica. Prosternum not 

 prolonged. Mesosternum obtuse in front, rather widely separating the coxae, the 

 epimera distinct, broader externally. Metasternum short, body apterous, epimera 

 distinct, posterior coxse slightly separated. Legs rather slender, middle tibise 

 slightly spin-ulose externally near the tip, anterior tibife moderately dilated, 

 emarginate internally, the inner spur at tlie upper angle of the notch. Tarsi 

 slender, the fourth joint simple. 



The males have four joints of the anterior tarsi quadrangularly dilated, the first 

 three with squamiform papilla; beneath, the middle tarsi are not dilated but the 

 first two joints are squamulose beneath. 



While I regret the muUiplication of tribes I aui unwilling to place 

 Zacotus either in the Broscini or Peleciini, and uiu8t therefore make it 

 the type of a separate tribe. 



In size and general appearance (except the head) it resembles J'rome- 

 coderus concolor Germ. The head is subquadrangular, slightly pro- 

 longed behind the eyes and then constricted but to a less degree than in 

 Pelecium, the front has similar longitudinal depressions but less marked. 

 The body is pedunculate as in the Broscini but the palpi are more nearly 

 those of Felecium. The maxilkc are hooked at tip in Zacotus and the 

 Broscini, not hooked in Pelecium. The niandibles have no setigerous 

 puncture. 



Zacotus seems therefore to form a tribe with nearly e(|ual relations 

 with the Broscini and Peleciini, and to indicate that these two tribes are 

 far more closely allied than any one has yet admitted. 



But one species Z. Matthewsii Lee, occurs in Washington Territory 

 and Vancouver. I am informed by Mr. Morrison that it lives near 

 small streams in dense woods. It is piceous with bright :>3neous or 

 cupreous surface lustre. 



TI'ANS. AM. I-.VT. ^^u-. IX. (?.8) OCTOliK.l!, ISSl. 



