216 WILLIAM J. FOX. 



]SIi(l(ll(> se.siinent above without a triangular depression, at the most with a 

 transverse series of foveae at the base ; fovese of the episternal suture of 

 niesopleurse about as usual ; markings yellow (no spot on metanotum) .51. 



51. — Space between hind ocelli decidedly less than that between them and the 

 nearest eye-margin ; middle segment with a well marked, triangular 

 enclosure, which is longitudinally and closely striated ; mesopleurae above 

 in additicm to the punctuation, distinctly striated : dorsulum very com- 

 pactly punctured (first abdominal segment with a band ; extreme tips of 



femora yellow) pleiiralis. 



Space between hind ocelli not much less than that between them and the 

 nearest eye-margin: middle segment without a well-marked enclosure, 

 the furrows formiug it obsolete basally; mesopleui-se (episternum ex- 

 cepted) not striated ; dorsulum with the punctures more or less sepa- 

 rated 52. 



52. — Clypeus and mandibles black; femora not yellow at tips ; lateral markings 

 (ui dorsal abdominal segments 3 and 4 slender, more or less sinuous ; 

 second ventral segment only maculated ; hind tarsi except first joint, 

 blackish (middle segment above with some coarse longitudinal ridges, 



which do not reach the base of the posterior face) nionticolus. 



Clypeus and mandibles more or less yellow, rarely black ; lateral markings 

 on dorsal abdominal segments 3 and 4 broad, not at all sinuous ; second 

 and third ventral segments maculated, hind tarsi yellow testaceous. .53. 



53. — Thorax with thick, matted pubescence of a pale fuscous color. Length 14 



mm. or over lai'gior 



Thorax with thin, pale grayish pubescence. Length 10 mm. or less. 



vieiiius. 



54. — Middle segment above with the central, longitudinal furrow wide, shallow 

 and much broadened basally, the furrow which margins the lateral 

 ridges of posterior face outwardly not or indistinctly foveolate ; e])ister- 



num niesopleuralis entirely black cogiiatiis. 



Middle segment above with the central, longitudinal furrow narrower, deep, 

 scarcely broadened basally, the furrow which margins the lateral ridges 

 of posterior face outwardly, distinctly foveolate or marked by strong, 

 transverse ridges; episternum niesopleuralis more or less yellow. 



Iiilaris. 



55.— Lateral ridges of posterior face of middle segment not strongly develi)i)ed, 



generally obsolete above the middle • . • -56. 



Lateral ridges of posterior face of middle segment very strongly developed, 

 not obsolete above, usually reaching the furrow which forms the enclo- 

 sure on upper surface inaculipeniiis. 



56._Viewed from the side the lateral angles of the head are seen to be pronunent 

 and more angular than usual (mandibles, a transverse band on dorsal 

 abdominal segments 1-5, and ventral segments 2-5, yellow) .ventralis. 

 Viewed from the side the lateral angles of the head are not more i)roniinent 

 than usual, rounded (mandibles black, dorsal abdominal segments 2-4 

 with a large yellow spot on each side, the fifth sometimes with a con- 

 tinuous band, ventrals entirely black) 57. 



57. — Head and thorax shining, the punctures tolerably fine, though not close ; the 

 furrow which margins the lateral ridges of posterior face of middle seg- 

 ment outwardly, rather strongly foveolate (episternum of the mesopleuife 

 and two spots on upper surface of middle segment, yellow). 



niti<Iiveiitris. 



