SOI CLES a Cy CUS meee) CC cary cretcalpaiclet stad icg, lelratetsi efeuaqelei a tei Tribe I. ACHILINI. 
Sides of clypeus not keeled; thorax with three keels.................... 
Tribe If. TROPIDUCHINI. 
Last joint of the rostrum short or very short. 
Head sometimes not narrewer than the thorax ; thorax not keeled or with one 
Obsoleteulceelamerut sed ott og vos uecetnanie wicceeaiie.e moe Tribe III. DERBINI. 
B Ocelli most frequently 3, the third ocellus on the apex of the frons and seldom 
wanting ; vein of clavus reaching to the apex, or united with the suture of 
thenclaviisgucamithevape xn. von scsi ieee racemes et Tribe IV. CIXIINI. 
Tribe I. ACHILINI. 
TABLE Of GENERA, 
Anterior tibiz about equal to the femora and trochanters united, or somewhat 
shorter, 
Posterior tibize with one spine or without spines, 
Head and thorax of equal breadth ........... G.1. Plectoderes, Spinola. 
Head narrower than the thorax. 
Vertex short, transverse, not or scarcely prominent before the eyes, or con- 
fused with the trons ; posterior tibize with one spine. 
Vertex distinct, anterior margin obtusely rounded or angulated ; thorax 
LWiGe;dssbroadtasnthe Meade, asm. ase G, 2. Achilus, Kirby. 
Vertex, before the eyes, distinctly produced. 
Eyes subrotund, beneath scarcely sinuate; wings with elongate areas be- 
fore the apical areas; trons narrowed upwards.................. 
G. 3. Helicoptera, A. et S. 
Tribe I. TROPIDUCHINI. 
TABLE OF GENERA, 
Vertex truncate at base ; thorax slightly and broadly roundedly sinuated at base. . 4. 
Vertex emarginated at base ; thorax posteriorly angularly emarginated. 
Radial vein forked before the middle or near the base of the wings........... ge 
Radial vein of wings simple or behind the middle of wings, or at least much 
longer at the base than the forked interior ulnar vein. 
Wings oval, convex, horny, sprinkled with dense, depressed granules, obsoletely 
EINE bee ee eee TC aictera ak aoc) ccios sd tera ee eG G. 1. Grynia, Stil. 
Wings membranous, distinctly veined. 
Head depressed ; frons subhorizontal; wings with a series of strongly 
oblique transverse veins, extending straight posteriorly and outwardly 
tastheyapexsor therclavus 2) i «mane anaes G. 2. Tambina, Stal. 
Frons more or less reclining, never horizontal ; anterior tibize equal in length to the 
femora and trochanters united or somewhat shorter. 
Lateral margins of clypeus distinctly keeled ; veins of clavus united very much 
ees REUTER ie Act vines acd an) es uss Vidg.yy | aja’ ae sg ladle e+ detieies os re 
Lateral margins of clypeus obtuse, sometimes slightly keeled at base ; wings ex- 
tending much beyond apex of abdomen. 
Wings with a double series of transverse veins toward apex, exterior ulnar vein 
simple. 
