BIBIO RUBICUNDUS. 251 



Fam. JBibionidae. 



4. Bibio ruhicundus , n. sp. 



Rufus ; puncto ocellari fusco ; rostro , palpis , antennis {?), 

 tihiis tarsisque nigris ; alis Jlavescentihus. — 9. Long 8 mm. 



Reddish yellow , except the rostrum , palpi , basal joints 

 of the antennae , and the tibiae and tarsi , which are black ; 

 most probably the flagellum of the antennae is black also, 

 but I am not quite sure of this as it is wanting in the 

 single specimen before me. The head is very shining and 

 the thorax also , though in a less degree ; on the vertex 

 a brown ocelloid spot is present. The wings have a greyish- 

 yellow tinge, towards the anterior margin inclining to 

 reddish-yellow; the veins agree in colour with that of the 

 surface. 



A female from Java (S. Muller). 



This species corresponds almost completely to the des- 

 cription of B. ohediens Ost. Sack. (Ann. Mus. Gen. XVI. 

 395) which, however, differs in having the wings brown- 

 ish , and darker along the anterior margin. 



5. Plecia tristis , n. sp. 



Nigricans ; thorace cano , vittis tribus nigris ; antennis pe- 

 dibusque piceis; alis laete fuscis. — Q. Long. 4 mm. 



Differs from all the East-Indian species in its small size 

 and the total absence of red colour. Head black; the 

 vertex conically elevated. Antennae piceous , a little 

 longer than the head, covered with short pubescence; the 

 joints closely connected together, the apical ones some- 

 what thicker. Thorax light-grey, with three black, shi- 

 ning, longitudinal bands, which in the middle are joined 

 together; the central band shortened behind, the lateral 

 ones shortened in front. Abdomen shining black. Legs 

 piceous , with short pilosity ; femora slender at the base , 

 thickened towards the end. Halteres blackish, with a 



JS'otes from tlie Hjeyden IMuseutn , Vol. "VI. 



