290 Natal Bees 
sixth segment) much narrower, with nearly the form of a half-circle ; 
very likely not more than a variety of M. barkeri. 
Doonside, 5th January, 1917 (A. L. Bevis). A close examination 
shows a few hairs in middle of mesothorax darker than the rest, 
indicating a slight approach toward the barkeri character. If the 
two are one species, heterotricha is probably a mendelian recessive. 
The following key separates the species of JJeyachile (including 
Gronoceras) in the last sending : 
Length 20 mm. or more ; thorax with black hair, abdomen covered 
with red hair.......... Gronoceras bombiformis (Gerst.) @. 
Much smaller ; or if large, abdomen not red.....................++- i 
1. Abdomen with conspicuous lateral patches of white 
tomentum, but not banded; large species, about 16 mm. 
long ; ventral scopia red......... Megachile funeberis Rad. 
INO SOS screeds uae So RO eet aa ree erate Sc ahs cee eer 2. 
2. Thorax above and at sides with black hair, abdomen with 
Fe 6 VR CR TIS: Sorcerer iss eIRSARE TT, COPE Teo, A ie pte 3: 
Abdomen not red haired; or if so, thorax not thus black 
hnairedie. Cis. wen. n Pe guce ee cass eee wee Seer eee 4. 
3. Females; ventral scopa red, clypeus keeled...fervida (Smith). 
Males ; face with ochreous hair................ JServida (Smith). 
4. Large species, 16 mm. long or over; abdomen grey with 
paler bands, the base sometimes red-haired................. 5. 
Smaller species; 14 mm- long: or less.::2....-....2-¢..cerees oe 6. 
5. Male with long spine at end of abdomen, and no red hair at 
base, (Durban; March,’ 1916, Ho Co Chubb)... 2)... -25 
Siu anne Dobe eenioh seks hemes eee ca Gronoceras felina (Gerst). 
Male without long spines at end of abdomen; hair at 
extreme base of abdomen red... Megachile cyanura, sp. nov. 
Female with red hair at base of abdomen ; head with black 
hair ; ventral scopa soot-colour............ cyanura, sp. nov. 
6. Females; hair of face white or cream-colour................... i 
Males... 5.34 e8sieeen ee anet oss eect tana e ns eer eer 14, 
7. Abdomen red-haired above, and the tegument also largely 
red (Winklespruit, Natal, 23rd and 29th December, 
1918, and 15th January, 1919, C. N. Barker; Durban, 
12th April, 1918, C. N. Barker) .-...... melliferrna, Ckll. 
