462 A. W. J. POMEROY. 



Simulium unicornutum, Pomeroy* 



^.Length, 1-5 mm. Antennae fuscous, heavily covered with silver-grey 

 pubescence. ' Thorax velvet-black, covered with thick golden pubescence ; meta- 

 thorax slate-blue and scutellum black, both covered with thick golden pubescence 

 and long golden hairs. Pleurae fuscous, lacking patch of soft hairs. Wings hyaline, 

 radius unforked. Abdomen velvet-black, with iridescent violet-blue patches on 2nd, 

 vS'th and 6th segments. Legs : front legs with coxae, femora and tibiae honey-yellow, 

 dark brown at the apex of the tibiae and a dark brown spot at the apex and near 

 the base of the femora, tarsi black ; hind legs with coxae fuscous, femora honey- 

 vellow, dark brown at apex ; tibiae dark brown, banded yellow at apex and across 

 middle • basal two-thirds of metatarsi pale, remainder of tarsus black, second tarsal 

 ioint with excision near base. Genitalia (PL xiii, hg. 2) : basal pieces rather broad ; 

 claspers a little longer than the basal pieces and rather tapered towards the apex, 

 which bears a single fmger-hke process ; anal plates rather short, bearing a clump 

 of bristles at apex and a few stout hairs at base ; adminiculum very broad, concave 

 at the centre, which bears a patch of numerous small curved hairs ; arms very strong, 

 ending mesally in a single long spine turned outwardlv. 



Habitat.— Bred from pupae attached to grass blades in small stream. 



Nigeria: Ibadan, 500 ft., 6.viii.l920, 9.xii.l920, ll.xii.l920. 



Described from specimens bred from isolated pupae corresponding in all details 

 to the type. Material placed in the British Museum. 



$. Length, 2-6 mm. Head with frons and face silver-grey, with hght golden 

 pubescence ; ' antennae fuscous, covered with fine grey pubescence, 1st, 2nd and 

 part of 3rd segments dull orange. Thorax and scutellum very dark grey, covered with 

 light greenish-golden pubescence. Pleurae dark brown, lacking patch of soft hairs. 

 Win^s hyaline, radius unforked. Abdomen dark brown, basal scale with fringe of 

 long* golden hairs, the three basal segments covered with golden pubescence, the 

 last" three segment's shining dorsally. Legs : front legs with coxae and femora honey- 

 \ellow, tibiae yellow, banded dark brown just above base and at apex, tarsi dark 

 "brown'; hind legs with coxae and femora honey-yellow, latter dark brown at apex, 

 tibiae dark brown, banded yellow at base and across middle; basal two-thirds_ of 

 metatarsus yellow, remainder of tarsus dark brown, second tarsal joint with excision 

 near base, claws with prominent thick tooth at base. 



Described from manv specimens of same date and from same locality' as males 

 and bred from isolated pupae corresponding in all details to the type. Not 

 found biting. 



Material in the British Museum. 



Simulium palmeri, sp. nov. 



.^ Length, 1-5 mm. Antennae black, covered with short grey pubescence. 

 Thorax : prothorax velvet-black, covered with thick golden pubescence, increasing 

 in area laterally and diminishing toward the median line ; mesothorax velvet-black, 

 covered with thick dark purple-brown iridescent pubescence ; metathorax shiny 

 slate-blue, dotted with a few sparse black hairs ; scutellum fuscous, covered with 

 dark hair's. Pleurae fuscous, lacking patch of soft hairs. Wings hyaline, radius 

 unforked. Abdomen velvet-black, covered with black hairs ; an iridescent violet 

 patch on the sides of the 2nd, 5th and 6th segments. Legs : front legs with coxae 

 fuscous ; femora fuscous, midcUe portion heavily covered with silvery pubescence, 

 brassy in some lights : tibiae covered with silvery pubescence, dark brown at apex ; 

 tarsi almost black and very hairy ; hind legs with coxae black ; femora deep purple- 

 brown ; tibiae light golden-yellow at base, remainder deep purple-brown, with a 



*Pom?roy, Ann. !\Iag. Nat. Hist. (9) vi, 1920, p. 79, pi. iii. 



