52 NEOTROPICAL PSELAPHIDAE 



not at all consistent with the anatomy of the genus. Furthermore, if Juhus 

 terranus is not assigned to Group IV, then it would go to a new group, since the 

 presence of vertexal sulci, minute vertexal foveae, first two tergites subequal in 

 length, and a distinct antennal club of only four segments, bars the species from 

 Groups I, II, III, V, VI, and VII. 



Much better data for its place in Group IV are obtained by checking its 

 similarities with the other species in this group. Juhus terranus is similar to 

 tetratomv^ (Reitter), caviventris Raffray, gracilicornis Raffray and related 

 species; it is distinct from all these forms on the described anatomy, especially 

 the male secondary sexual characters, antennal proportions and sternal features. 



JuhiLS chickeringi new species 



Total length 0.837 mm. Greatest width 0.295 mm. 



Color light brown with the antennae, maxillary palpi and legs paler. Body 

 pubescence yellowish cream, short, appressed. Average length of body pubes- 

 cence 0.02 to 0.034 mm. 



Head rounded-triangular, eyes large and prominent. Eyes composed of 

 about 36 small facets. Occiput sinuate with a clearly defined median notch. 

 Temporal angles rounded, their length less than the longitudinal diameter of 

 the eye from a dorsal view. Vertex evenly convex, conspicuously higher than 

 the eyes; vertexal foveae minute, nude, not wider than their associated sulci, 

 and situated on a line which passes through the middle of the eyes. Vertexal 

 sulci as in terranus. Antennal insertions close together at base, narrowing the 

 front as in the typical pattern for the genus. Front almost vertical, simple. An- 

 tennae eleven-segmented, segment I large, as wide as II; III, IV, V, VI, and VII 

 narrower than II ; III a little longer than IV, of equal width ; V, VI, VII pro- 

 gressively transverse, subrhomboidal, with their lateral basal angles progres- 

 sively reduced; VIII, IX, X, and XI forming a distinct club, these segments 

 progressively slightly wider; VIII wider than II; XI narrowly truncate at base, 

 broadening rapidly to basal third and then narrowing slowly to the subacute 

 apex. Maxillary palpi four-segmented, first segment minute; second elongate, 

 arcuate, slightly clubbed distally where it articulates with the third; third 

 shorter, triangular, wider than second; fourth large relatively, wider than third 

 segment, as long as other three segments, widest beyond base, then lengthily 

 acute to apex which has a small palpal cone. Ventral surface of the head typical 

 for the genus, with the wide mentum and produced cardo. Eyes prominent ven- 

 trally. Tempora long ventrally, their length distinctly greater than the longi- 

 tudinal diameter of the eyes from a ventral view. V-shaped pattern very clear, 

 the converging carinae fusing to form the apex of a triangle or V at a point near 

 the posterior limit of the eyes. Posterior to this fusion, the converged carinae 

 continue to the base of the head, where they are lost in a semicircular sulcus 

 which separates the neck from the head. Enclosed surface of the V regularly 

 arcuate in its longitudinal diameter, from a high point at the fusion of the 



