416 



FAMILY XI. — STAPH YLTNI DiE. 



dd. Prosternuin prolonged behind so as to reach the mesosternmn. 

 g. Sides of prosternuin not dilated under the coxa?. 



h. Neck never very slender; ligula loosely fringed at tip. 



i. Labrum with teeth. 



j. Teeth of labrum two in number. 

 Jc. Antenna? with the two basal joints thick, the others 

 slender, filiform; basal joints of hind tarsi distinctly 

 longer than second; length less than 3.5 mm. 



I. Gular sutures moderately separated, gradually con- 



verging and most narrowly separated at base ; front 

 tarsi more or less dilated; surface distinctly punc- 

 tured. XLVII. SCIOCHARIS. 



II. Gular sutures very widely separated and nearest to- 



gether in front, thence widely diverging to base of 

 headT front tarsi not at all dilated; surface not dis- 

 tinctly punctured. XLVIII. Sciociiarella. 

 Mc. Antenna? with the basal joints of equal thickness with 

 the others, the apical ones feebly enlarged; teeth of 

 labrum very small ; prosternuni not carinate. 

 m. Basal joints of hind tarsi equal in length to second, 

 the first four joints short and subequal ; gular su- 

 tures most narrowly separated a little before the 

 middle. % XLIX. Teach ysectus. 

 mm. Basal joints of hind tarsi distinctly longer than sec- 

 ond, the tarsi more elongate; front tarsi strongly 

 dilated, especially in the male; gular sutures most 

 narrowly separated at base ; neck wide, almost half 

 as wide as head. L. Paeamedon. 

 ij. Labrum with four teeth, the inner ones long, acute, and 

 prominent, the outer ones very small; gular sutures 

 widely separated at base. Platymecox. 



ii. Labrum without teeth : body very slender, finely and very 



densely punctate; gular sutures as in Platymedon; first 

 joint of hind tarsi longer than second. 



LI. PSEUDOMEDOX. 



hh. Neck, in our species very slender; ligula tricuspid at tip; 

 labrum with four teeth. LII. ScoP-EUS. 



gg. Sides of presternum broadly dilated under the coxa?, reaching 

 the inflexed sides of thorax; neck very slender. 

 n. Antenna? distinctly longer than head ; length 3.5 or more mm. ; 

 hind tarsi with joints 1 to 4 gradually decreasing in length, 

 o. Form rather slender; labrum broadly rounded or subtrun- 

 cate at apex, the teeth usually acute; front tarsi finely 

 and densely pubescent beneath. LIII. Stiltcus. 



on. Form very stout; labrum sinuate-emarginate at apex, the 

 two teeth short, obtuse; front tarsi not at all dilated, hav- 

 ing long coarse hairs beneath ; head orbicular, the surface 

 minutely punctate or alutaceous. LIV. Megastilicus. 



