Genus Cemus Fennah, 1964

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Regional Maps

• Cemus Fennah, R.G. 1964. Delphacidae from Madagascar and the Mascarene Islands (Homoptera: Fulgoroidea). Transactions of the Royal Entomological Society of London 116: 131-150 [147].

  Type species:

   Cemus leviculus Fennah, 1964 by original designation.

Introduction

A genus with a number of closely similar species distributed from Madagascar in the western Indian Ocean to Samoa in the Pacific. Two species have been recorded in Australia, both from coastal Queensland.

Distribution

States

Queensland

IBRA and IMCRA regions

IBRA

Qld: Brigalow Belt North (BBN), Central Mackay Coast (CMC), South Eastern Queensland (SEQ), Wet Tropics (WT)

Diagnosis

Vertex shorter submedially than broad at base, broadly and obtusely rounding into frons, as broad at apex as at base, lateral margins slightly concave, apical margin transverse with submedian carinae not prominent, Y-shaped carina distinct, submedian carinae uniting on the frons, basal compartment of vertex wider at hind margin than greatest length (abouit 2.5 : 1), frons in middle line longer than wide at widest part (about 1.8 : 1), widest at level of ocelli, lateral margins straight, weakly convergent below this level, median carina forked at level of ocelli, clypeus at base slightly wider than frons at apex, postclypeal disc about as long in middle as broad at base; rostrum reaching to post-trochanters, with apical segment about as long as subapical; antennae reaching almost to level of apex of post-clypeus, basal segment longer than broad (more than 2 : 1), second segment longer than first; ocelli distinct, very close to anterior margin of gena. Pronotum with disc shorter in middle line than broad at anterior margin (about 1 : 1.3), lateral carinae concave, not attaining hind margin. Total length of mesonotum in macropterous form longer than that of scutellum (about 2.2 : 1). Fore and middle femora and tibiae a little compressed but not, or only feebly, foliately expanded. Post-tibial spur with about 30 teeth. Abdomen of male with anterior margin of seventh sternum obtusely but distinctly angulate at middle. Posterior margin of eighth sternum shallowly convex throughout, median portion rather flattened. Anal segment of male short, ring-like, lateroapical angles more or less tumid, each produced ventrad in a slender spinose process. Pygofer short dorsally, long, and strongly convex ventrally, posterior opening relatively small, much longer than broad, dorsolateral angles feebly produced, strongly inflected; diaphragm long dorsoventrally, with dorsal margin weakly concave, deeply incised medially, medioventral process short, broader than long, quadrate. Aedeagus long, slightly decurved distad, with a long flagellum arising at apex, directed cephalad, and ornamented at middle of its dorsal margin with one or two processes. Genital styles simple, narrow, usually tapering distally to acute apex, directed dorsad, in posterior view only weakly diverging. (Fennah 1964)

ID Keys

Fennah 1965: 4

Diagnosis References

Fennah, R.G. 1964. Delphacidae from Madagascar and the Mascarene Islands (Homoptera: Fulgoroidea). Transactions of the Royal Entomological Society of London 116: 131-150 [147]

Fennah, R.G. 1965. Delphacidae from Australia and New Zealand (Homoptera: Fulgoroidea). Bulletin of the British Museum (Natural History) Entomology 17(1): 1-59 [4]

History of changes