448. 

 LASIOGLOSSUM TRICINGULUM. 



Order Hymenoptera. Fam. Andrenidae. 



Type of the Genus, Lasioglossum tricingulum Curt. 



Lasioglossum Curt. Guide, Gen. 704*. 



Antenna of the male inserted near the centre of the face, longer 

 than the head and thorax, slightly fusiform, composed of 13 

 joints very similar to Halictus. 



Labrum transverse-ovate, sides straight, angles rounded and 

 slightly emarginate, anterior margin convex and ciliated with 

 long hairs, broadest at the base (2). 



Mandibles not so much dilated at the base as in Halictus. 

 MaxillcE very slender, lobe as long as the Paraglossse, lanceolate, 

 not notched towards the apex. Palpi one third longer than the 

 lobe, 6-jointed (4). 



Mentum long and very slender. Labium rather long lanceolate 



and very pubescent on the sides and at the back (5 c) : Para- 



glossce half the length of the lip, lanceolate and slightly ciliated 



(d). Palpi longer than the paraglossae, but shorter than the 



lip, 4-jointed (b). 



Head ovate, depressed and porrected nearly horizontally : eyes long 



narroio and lateral : ocelli 3. Thorax globose, a little larger than 



the head. Abdomen ovate and convex, considerably broader than the 



thorax. Wings ample, the cells similar to Halictus, as well as the 



legs. 



Tricingulum Curt. MSS. 



Male black, shining and pubescent, exceedingly minutely and 

 thickly punctured and clothed with soft ochreous hairs : abdo- 

 men with a whitish fascia, narrowest at the middle, at the base 

 of the 2nd 3rd and 4th segments, the 5th segment slightly grey 

 with pubescence, the apex ochreous : wings iridescent, the pos- 

 terior margin slightly fuscous ; stigma ochreous, nervures pale 

 brown : posterior tibiae ochreous, and tarsi, excepting the 1st 

 pair, whitish ochre, tipped with ferruginous. 



In the Author's Cabinet. 



This singular and I believe nondescript species appears to 

 form a beautiful connexion between the Andrenidae and Apidae, 

 but unfortunately the female is unknown. I took 3 males at 

 Ventnor in the Isle of Wight, flying about flowers near the 

 sea-shore, the 12th September 1826, and one of them was Sty- 

 lopsed ; they look very long on the wing, in consequence of 

 the head, antennae, and bodies being carried horizontally. 

 Those parts that I have not described or but slightly, are si- 

 milar to Halictus, which I shall now illustrate. 



