50 CASEY 



The genera here considered may be defined as follows: — 



Mesosternum and metasternum anchylosed, the suture obsolete or very 

 fine 2 



Mesosternum separated from the metasternum by a distinct cleft 14 



2 — Outer antennal joints more or less obliquely truncate beneath, always 

 more rapidly or abruptly narrowed basally, and usually with sensitive 

 setigerous pores in addition to the fossae, the latter in a few cases wholly 



obsolete 3 



Outer antennal joints enlarged within apically, or more typically serriform, 

 not more rapidly or abruptly narrowed basally, usually without aggre- 

 gated sensitive pores but always having an intero-terminal sensory 



fossa; antennae shorter and more compact as a rule 10 



3 — Last antennal joint with a terminal process, wanting apparently only in 

 the male of Hippomelas; sensory fossae terminal, diversely developed 

 and sometimes obsolete; pronotum never sulcate. Sonoran faunal 



regions 4 



Last antennal joint without trace of terminal process in either sex 6 



4 — Last antennal joint of the male without evident terminal process; body 

 moderately stout to narrow and subcuneate, convex, more feebly and 

 evenly sculptured, the sides of the prothorax more evenly converging 

 from base to apex and frequently nearly straight ; tarsi variable. [Type 

 Buprestis saginata Mann .] Hippomelas 



Last antennal joint having a distinct terminal process in both sexes; sculp- 

 ture of the integuments deeper and more irregular 5 



5 — Pronotum with the basal bead never entire but always interrupted 

 medially, where it joins the raised median smooth line; tarsi more 

 slender and elongate, the basal joint of the posterior almost always 

 longer than the next two combined; sculpture moderately diversified. 

 [Type Chalcophora planicosta Lee] Gyascutus 



Pronotum with the basal bead strong, even and entire, not obliterated at 

 the middle; tarsi shorter and thicker as a rule though variable, the 

 basal joint of the posterior not as long as the next two combined; 

 sculpture rough though more uniform, that of the pronotum almost 

 as in Spinthoplera. [Type Chalcophora ccelata Lee] Stictoeera 



6 — Outer antennal joints with lateral as well as apical sensory fossae. Body 

 more or less parallel, the apical part of the elytra regularly ogival as 

 a rule and narrowly truncate and bispinulose at the apices; prono- 

 tum wholly devoid of basal beading, not sulcate though sometimes in 

 part feebly, longitudinally impressed medially; elytra with impressed 

 series of coarse punctures, and, in addition, scattered finely punctulate 

 and puberulent shallow areolae, which are usually bright metallic in 

 coloration; prosternum bisulcate, transversely truncate anteriorly; 

 basal segment of the abdomen feebly flattened to deeply sulcate ; tarsi 

 thick, the first joint of the posterior but Httle longer than the second. 

 Sonoran and Neotropical regions. [Type Psiloptera valens Lee.]. 



Spinthoptera 



