TYRINI 319 



segments, eleventh not toothed, anterior trochanters not toothed; 



pubescence dark brownish-yellow 



veracruzensis jletcheri new subspecies 



This group key is complete with the exception of rossii described from 

 Paraguay. Rossii measures 1.96 mm. in length and is said to be near hirtus 

 but has a larger head, more transverse antennal tubercles, antennal segments 

 V-VIII more transverse, IX more transverse and X much longer than hirtus. 

 Rossii has the first two visible tergites subequal in length and a simple 

 metasternum. 



Hamotus (Hamotus) costaricensis new species 



Type. Measurements: Head 0.45 x 0.43 mm.; pronotum 0.47 x 0.50 mm.; 

 elytra 0.60 x 0.87 mm.; abdomen 0.60 x 0.90 mm. Total length 2.12 mm. 



Shining brownish-yellow. Pubescence light tan color, sparse, very short 

 and stiff. Integument lightly punctulate. 



Head slightly elongate with long tempora, much longer than wide and 

 longer than eyes. Eyes strongly reniform, composed of about 92 small facets. 

 Vertex and occiput simply convex, with three foveae: a pair of small vertexal 

 foveae, each about the size of an ocular facet, nude, punctiform, on a line 

 through posterior third of eyes and equidistantly placed; a third fovea even 

 smaller, punctiform, nude, on a line through anterior third of eyes in center 

 of head. Front narrowed to form two small antennal tubercles separated 

 medianly by a shallow sulcoid impression which extends posteriorly to median 

 vertexal fovea; front very narrow and vertical from inter-antennal depression 

 to clypeus. Clypeus simple, with a strong semi-circular carina just posterior 

 of apical margin, extending from side to side as in Juxtahamotopsis. Labrum 

 very transverse. Right mandible crossed dorsad to left; jaws strong with large 

 teeth. Ventral surface of head broad and very flat, with a large circular, nude 

 fovea at middle of base. 



Maxillary palpi four-segmented; first minute, cylindrical; second elongate, 

 base pedunculate and no wider than first, arcuate, becoming strongly inflated 

 at apex; third short, triangular with angulate internal and convex external 

 face, less than half as long as second, nearly twice as wide as second; fourth 

 one-third longer than second, nearly twice as wide as third, elongate-oval with 

 base obliquely truncate base and rounded apex, internal face nearly straight, 

 external face convex; palpal sulcus of internal face elongate-oval, extending 

 obliquely from apex to basal fourth, the basal fourth of the segment, there- 

 fore, not sulcate; palpal cone strong and blunt, set obliquely in the apical 

 end of the sulcus. 



Antennae eleven-segmented; I elongate-cylindrical; II shorter, slightly 

 narrower and quadrate; III asymmetrically narrowed at base, but with length 

 equal to apical width; IV-VIII moniliform, becoming very slightly transverse; 

 IX slightly longer and wider, slightly transverse, subtrapezoidal; X similar, 

 slightly larger; XI large, truncate at base, twice as wide as tenth, as long 



