222 SUPPLEMENT. 



4. Flecia collaris. 



Hirtea collaris, Fabr. Syst. Antl. p. 54 \ 



Plecia collaris, Wiedem. Dipt. Exot. i. p. 32 2 ; Aussereur. zweifl. Ins. i. p. 74 s ; Schiner, Reise 



der Novara, Dipt. 21 *. 

 Plecia bicolor, Bellardi, Saggio etc. i. p. 16 s ; O. Sack, antea, p. 3 e . 



Hab. Mexico 5 6 , Cordova and Orizaba (Saussure 4 ), Teapa in Tabasco ( H. H. 

 Smith). — South America 1 2 3 4 . 



Four specimens from Teapa agree well with Wiedemann's brief description, 

 save that the stem of the halteres is not red. Ten other examples, from Teapa 

 and Cuernavaca, differ in being smaller and in having the black of the mesonotum 

 less extensive. Schiner 4 says of the species : " In den Furchen schimmert die lichter 

 Behaarung weisslich," nothing of which is apparent in these specimens. 



5. Plecia quadrivittata, sp. n. 



c? . Black throughout. Head lightly grey-pollinose ; face prolonged in front of the eyes about as far as the 

 vertex projects backwards ; eyes elongate oval, the ocellar tubercle prominent. Thorax and scutellum 

 lightly dusted with greyish, opaque, the mesonotum with four shining black stripes, the lateral ones 

 abbreviated in front, the narrowly separated median ones behind. Abdomen moderately shining. 

 Wings uniformly brown : the anterior branch of the third vein is at an angle of about forty-five degrees, 

 arising nearly opposite the end of the second vein and terminating in the costa a little less than its own 

 length from the tip of the second vein ; penultimate section of the third vein a little longer than the 

 length of the anterior cross-vein ; furcation broad in the margin ; anal cell wide open. Proboscis longer 

 than the distance from the vertex to the lower end of the face. Length 6-7 millim. 



$ . Larger ; abdomen opaque brownish-black. 



Hab. Mexico, Rincon in Guerrero 2000 feet [H H Smith). 

 Six males and one female. 



BIBIO (p. 3). 



6. Bibio dubius. 



Bibio dubius, Bellardi, Saggio etc. i. p. 18 \ 

 Hab. Mexico 1 , Jalisco [Schumann). 



Four specimens, apparently belonging to the same species, though three of them 

 have the posterior coxae blackish, the tibiae reddish, &c. These examples agree with 

 the one from Costa Rica mentioned by Osten Sacken {antea, p. 3, under sp. no. 1) in 

 not having the stigma darker. B. dubius was placed by him amongst the unidentified 

 Mexican Bibionidse [antea, p. 5). 



7. Bibio ? 



J . Deep shining black ; femora for the most part red, the remainder of the legs chiefly pitchy or reddish- 

 brown. Eyes hairy. Mesonotum with rather abundant dusky white pile. Abdomen whitish pilose- 

 Wings brown ; stigma distinct ; second posterior cell sessile. Length 8 millim. 



Hab. Mexico, Mexico city, Jalisco, Atoyac [Schumann). 



