EUPLECTINI 91 



Eighth antennal segment not transverse, not wider than seventh, and 



distinctly narrower than ninth segment sharpi 



(1.1-1.2 mm.; Mexico) 



4. Pronotum regularly suboval insignis 



(1.1 mm.; Blumenau, Brazil) 

 Pronotum strongly cordiform, with the lateral margins angulated and 



subincised anterior to middle clavatus 



(1.3 mm.; Mexico) 



5. Disc of pronotum with a small subapical fovea brevicollis 



(1.1 mm.; Mexico) 

 Disc of pronotum with an elongate sulcoid or fusiform foveoid de- 

 pression 6 



6. Depression on pronotal disc in the form of a deep, sulcoid, medianly 



longitudinal depression, with the apical end of this depression 

 broadest and rounded; tempora long, longer than the eyes in both 



sexes, the eyes relatively small obscurus 



(1.25 mm.; San Geronimo and Capetillo, Guatemala) 

 Depression on pronotal disc in the form of an elongate, fusiform de- 

 pression, median, and with both ends tapered; tempora short, only 

 half as long as the eyes in the male (female unknown) , the eyes rela- 

 tively very large, two-fifths the length of the head 



barrocoloradoensis new species 



Thesiuni barrocoloradoensis new species 



Measurements: Head 0.2 x 0.25 mm.; pronotum 0.2 x 0.3 mm.; elytra 0.36 

 X 0.4 mm. ; abdomen 0.5 x 0.4 mm. ; penis 0.18 x 0.1 mm. ; metastemum 0.2 mm. ; 

 antennae 0.4 mm. Total length 1.26 x greatest width 0.4 mm. 



Yellowish-brown, with long sparse pubescence; head and pronotum asper- 

 ate, the asperities each bearing a seta. 



Head trapezoidal, occiput with a short, median, longitudinal carina which 

 does not end on the vertex in a fovea; two vertexal foveae placed on a line 

 passing through the middle of the eyes, their orifices slightly anteriorly directed, 

 and with the floor of each fovea attached to an arm of the supratentorium. 

 Supratentorium massive. Eyes large, two-fifths as long as head. Tempora very 

 short, half as long as the eye. Front broad, with a short, blunt, median tubercle 

 at the beginning of the declivity, between the antennae. Ventral surface with a 

 small gular fovea, the floor of which is attached to the supratentorium. 



Antennae eleven-segmented, rather widely separated, segment I a little 

 longer and half wider than second, oblong-obconic; H ovate; III obconic, half 

 the width of second; IV transverse, submoniliform, as wide as third but shorter; 

 V-VII slightly wider than fourth, about as long, transversely submoniliform; 

 VIII asymmetrically transverse, as wide and as long as seventh ; IX distinctly 

 wider and longer than eighth, transversely trapezoidal; X gradually wider than 

 ninth, longer, transversely trapezoidal; XI as wide as tenth, in two portions, a 

 basal cylindrical portion almost twice as long as the tenth segment, and a much 



