COSSONINI, Schoenherr, 1825

Zimmerman, Elwood C., 1942, Curculionidae of Guam, Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 73-146 : 120-121

TRIBE COSSONINI KEY TO THE GENERA FOUND IN GUAM

1. Antenna! funicle5-segmented....................................................... 2

Antenna! funicle 7-segmented........................................................................................ S

2(1). Third tarsal segment deeply bilobed.................................................. Choerorrhinodes .

Third tarsal segment not at all bilobed, entire and subtruncate distally........ 3

3(2). Rostrum long and slender, one and one half to two times as long as the head (in the Guam species); eyes separated from the prothorax by two or three times the length of an eye................................................................ Stenotrupis .

Rostrum shorter and stouter, shorter or as long as the head but never distinctly longer; eyes separated by less than twice their lengths from the prothorax..............................

.

4(3). Intercoxal process of the prosternum not broader than the breadth of a coxa ..............................................................................................................Tytthoxydema .

Intercoxal process of the prosternum about twice as broad as a fore coxa ................................................................................................................Rhinanisodes .

5(1). Eyes ventro-lateral, contiguous with the anterior margin of the prothorax at their lower hind corners........................................................................... Himatinum .

Eyes lateral, distant from the fore margin of the prothorax.............................. 6

6(5). Rostrum obviously expanded beyond the insertion of the antennae, or the dorso-lateral margins of the rostrum distinctly emarginate behind the antennae or both............................................................................................................ 7

Rostrum not or but slightly and inconspicuously expanded beyond the insertion of the antennae, the dorso-lateral margins not emarginate behind theantennae........................

....

..

.

7(6). Derm roughly sculptured and dull; posterior part of the scrobe distant from the lower margin of the eye, scape, at rest, lying far below the lower orbitalmargin ..............................................................................................Dryotribodes .

Derm shiny; upper edge of the posterior part of the scrobe contiguous with the lower margin of the eye; scape at rest, touching the lower orbital margin .......................................................................................................................·......8

8(7). Third hind tarsal segment obviously broader than the second; dorso-lateral margins of the rostrum not emarginate behind the antennae................ Oxydema .

Third hind tarsal segment hardly broader than the second; dorso-lateral margins of the rostrum distinctly emarginate behind the antennae.............. TODO

9(6). Rostrum not as long from the fore margins of the eyes to the apex of epistome as its basal breadth, shorter than the side of head from the fore edge of eye to prothorax............................................................................ Macrancylus .

Rostrum longer from the fore margins of eyes to apex of epistome than its basal breadth, longer than the side of head.......................................................... 10

10(9). Lateral cephalic constriction not continued across the dorsum, the crown not separated from the front by a distinct difference in sculpture, but continuously punctate to base.......................................................................... Eutornus .

Lateral cephalic constriction continued across the dorsum, the area· behind the constriction conspicuously marked off from the front by a difference in sculpture, the crown behind the constriction impunctate.... Phloeophagosoma .

Note: These last three dichotomies are for the separation of the Guam species only, and they may not be applicable to the species of other regions.