BEES IN BRITISH MUSEUM. 353 



abruptly bent ; head, thorax and abdomen yellowish-green; abdo- 

 men with apical hair bands on segments 2-5, and basal ones on 2 

 and 3 at least ; tibiae and tarsi, and most of middle and anterior 

 femora, red, but hind femora dark ; abdomen broad basally. 



Halictus exiguus Sm. 9 (T.). 



Venation of Chloralictus ; hind spur with few long spines; head 

 aud thorax yellowish-green, head of the broad type, cheeks broad. 

 The most obvious distinctive character is the smooth and shining 

 mesothorax, the basal area slightly rugoso- plicate towards the base. 



Halictus erraus Rits. (vagans, Sm.) 9 (T.). 



Second s. m. broad ; stigma very pale honey ; hind spur with 

 three teeth, the first stout and spine like, the second a flattened and 

 rounded lamina, the third a mere rudiment; abdomen very broad, 

 yellowish green, hind margins of segments broadly testaceous; base 

 of metathorax minutely rugose-wrinkled, with no large plicae. 

 Eyes, etc., of typical Halictus. 



Halictus providcus Sm. 9 (T). 



Hind spur with about 5 spines. Is an Evylceus with a large broad 

 head, facial quadrangle very much broader than long. Third s. m. 

 strongly convex on outer side; cheeks broad and subquadrate; 

 mesothorax shining, with very sparse punctures; first abd. s. very 

 shining, impunctate. 



Halictus hespcrus Sm. 9 (T.). 



Eyes, etc., of Halictus; head broad, facial quadrangle about 

 square; hind spur with three broad teeth; abdomen strongly 

 yellowish green, the pale ochraceous hair-bands basal and apical ; 

 third s. m. much longer than second, but very broad above, with 

 outer margin little curved. 



Halictus descrtu* Sm. 9 (T.). 



Hind spur serrate; second and third s. m. very broad, third with- 

 out any distinct double curve on outer margin ; area merely minutely 

 granular; looks much like coriacens or politus, but is smaller, 

 stigma browner — not nearly so yellow, wings not yellow like 

 politus, etc. 



H. politus (schenckii, Rits.) has hind spur serrate, but the teeth 

 are rather longer. 



TRANS. AM. ENT. SOC. XXXI. (45) SEPTEMBER, 1905. 



