Crematogaster (Crematogaster) rivai Emery

Type location Ethiopia (C. Rivai n. sp., Emery, 1897e: 598, illustrated, worker) from Ganana; in spines of Acacia larin - see below
junior synonym (here) luctuosa (Menozzi, 1930b: 96, illustrated, worker) from Ethiopia - see http://www.antweb.org/specimenImages.do?code=casent0912719
worker only described (see Bolton, 1995) .

Emery's (1897e) description is at . Menozzi's (1930b) description of luctuosa is at ; Menozzi also gave a description of the nest on Acacia bussei and its construction of carton - see Nest page 1 and Nest page 2.

The photomontage of a type collection (minor) worker is collated from http://www.antweb.org/specimen.do?name=casent0904516

Oxford University Museum specimens

Crematogaster (Crematogaster) rivai B Taylor det.	Sudan J Mathews JM 072	23.x.2000 Kordofan 11°21' N 34°27' E	El Ain near El Obeid pyrethrum fogging of Senegalia senegal	3
Crematogaster (Crematogaster) rivai B Taylor det.	Sudan J Mathews JM 075	23.x.2000 Kordofan 11°21' N 34°27' E	El Ain near El Obeid pyrethrum fogging of Senegalia senegal	1
Crematogaster (Crematogaster) rivai B Taylor det.	Sudan J Mathews JM 078	23.x.2000 Kordofan 11°21' N 34°27' E	El Ain near El Obeid pyrethrum fogging of Senegalia senegal	5
Crematogaster (Crematogaster) rivai B Taylor det.	Sudan J Mathews JM 091	23.x.2000 Kordofan 11°21' N 34°27' E	El Ain near El Obeid pyrethrum fogging of Senegalia senegal	1
Crematogaster (Crematogaster) rivai B Taylor det.	Sudan J Mathews JM 276	30.vi.2001 Khordonia 11°51' N 34°15' E	Damazine Plantation, Blue Nile semi-natural forest; pyrethrum fogging of Senegalia senegal	1

The photomontage is of a major specimen from Sudan, collected by J Mathews, by pyrethrum fogging of Senegalia senegal (formerly Acacia senegal); Kordofan, El Ain, near El Obeid, ca 12°56' N 30°35' E, JM 072, 23.x.2000, 3 workers (selected as representative of the polymorphism) plus very many unmounted; also JM 040, 2 workers, 18.x.2000; JM 078, 6 workers plus ca 80 unmounted, 24.x.2000; and, JM 091, 25.x.2000, 1 worker plus 13 unmounted. Note almost all the workers seemed to be covered in a flaky material, possibly of the gum of the host Senegalia senegal. The 4-segmented antennal club is quite distinct but the colour is intermediate between the uniform dark brown of the type and the Menozzi almost uniform black of luctuosa.

The photomontage is of a major worker from Sudan, JM 091.

The photomontage is of a media worker from Sudan, JM 078.

The photomontage is of a minima worker from Sudan, JM 078.