72 CASEY 



Dicerca, and the frequent posterior prolongation of the elytra in 

 Psiloptera, also betraying an obscure bond of affinity with that genus 

 and presumably signifying derivation from a common primitive stock. 

 The striation of the elytra is much more developed and obvious than 

 in the Hippomelids, the hind coxas rapidly dilated within as in Hip- 

 pomelas and Stictocera, the outer antennal joints much compressed, 

 rectilinearly truncate beneath as in those genera and wholly differing 

 from Dicerca, densely punctulate along their obliquely flattened lower 

 edges and with sensory fossa; lateral and linear in form, as well as 

 one terminal, which is narrow, deep and oblique. The hind tarsi are 

 thick, with the three basal joints progressively diminishing very slightly 

 in length; sexual differences are virtually unobservable. The species 

 and subspecies of our fauna may be outlined as follows: — 



Prothorax widest at or near the middle; elytra arcuately narrowing pos- 

 teriorly and more or less obtuse 2 



Prothorax widest at base 6 



2 — Prothorax rounded at the sides; first ventral segment merely flattened 



along the median line 3 



Prothorax angulate at the sides at or slightly behind the middle; first ven- 

 tral segment deeply sulcate along the median line 5 



3 — Antennae metallic blue or greenish throughout. Body large in size, 

 stout, convex, shining, dark steel-blue, the impressions bright greenish- 

 aeneous, subglabrous, the elytral areolae densely punctate and having 

 short decumbent pubescence, the irregular sparse vestiture of the under 

 surface longer, decumbent, arranged in sparse radiating clusters of 

 three or four hairs each from the very coarse transverse punctures, 

 especially of the abdomen; head very coarsely rugose throughout, the 

 antennas short, but little longer than the head in either sex, slightly 

 more apically attenuated in the male; eyes large though only moder- 

 ately prominent, widely separated; prothorax barely twice as wide as 

 long, widest behind the middle, the sides broadly, subevenly rounded, 

 becoming gradually more convergent apically and feebly so and slightly 

 sinuate basally, the basal angles right; apex feebly arcuate except later- 

 ally, the base very broadly lobed, sometimes subangularly; surface 

 convex anteriorly and laterally, more flattened basally and with a dis- 

 tinct subquadrate impression at the middle near the base; punc- 

 tures very coarse and irregular, generally sparce medially, verj' unevenly 

 and vcrmicularly contluent laterally; scutcllum small, rounded; elytra 

 but Httle wider than the prothorax, not quite twice as long as wide, 

 Ijaraflel, gradually rounding at the sides and obliquely, subarcuately 

 narrowed in apical two-fifths to the apices, the latter narrowly truncate, 

 sometimes obliquely with the sutural angle more prominent; punctures 

 large, impressed, arranged in regular series which are slightly impressed. 



