6 



DIPTERA. 



N AUSIG ASTER. 



Nausigaster, Williston, Trans. Am. Ent. Soc. xi. p. 33 (1883) j Synopsis N.-Am. Syrphidse, p. 21 

 (1886). 



1. Nausigaster punctulata, 



Nausigaster punctulata, Willist. Trans. Am. Ent. Soc. xi. p. 34, t. 2. f. 15 l , & xv. p. 259 2 ; 

 Synopsis N.-Am. Syrphida?, p. 21, t. 1. figg. 10, 10« \ 



Edb. United States, California 3 , New Mexico 1 3 . — Mexico 3 , Isthmus of Tehuan- 

 tepec 3 . — Brazil, Chapada 2 . 



I have seen but a single specimen of this insect from Central America, the one 

 mentioned in my Synopsis, p. 22, and this differs very much in the markings of the 

 wings from the typical ones from the United States. The example from Brazil, 

 examined by me, is quite like the Central-American one, and I am, more than ever, of 

 the opinion that the form is distinct from the more northern one. 



PIPIZA. 



Pipiza, Fallen, Dipt. Svec, Syrph. p. 58 (1816). 

 Heringia, Rondani, Dipt. Ital. Prodr. i. p. 53 (1856). 

 Pipizella, Rondani, Dipt. Ital. Prodr. ii. p. 185 (1857). 

 Cnemodon, Egger, Verh. zool.-bot. Ges. Wien, xv. p. 573 (1865). 

 Penium, Philippi, Verh. zool.-bot. Ges. Wien, xv. p. 741 (1865). 



l. Pipiza (Heringia) 



Antennae reddish-black, the first joint yeUow. Pace shining greenish-black, with yellowish pile Erontal 

 tnangle on the upper part opaque black, with erect black pile ; below like the face. Eyes black-pilose 

 Mesonotum brownish or bronze-black, but Httle shining, with yeUowish pile. Abdomeu opaque black 

 shmmg metalHc on the sides ; pile very short. Legs black ; first two joints of the four anterior tarsi and 

 the tip of the hind metatarsi and the two following joints light yellow ; hiud metatarsi thickened • 

 hrnd iemora with long white pile; hind tibise densely black-ciHate behind. Wings subhyaline the 

 stigma yellow. J ' 



Length 6 millim. 



Hab. Mexico, Xucumanatlan in Guerrero 7000 feet (//. H. Smith). 

 One specimen. 



This species is very similar in structure to P. pidchella, Willist., Synopsis N -Am 

 Syrphid*, p. 29, t. 2. figg. 1, 1 a , 1 b. The ultimate section of the fourth vein is bent' 

 not broken, and there is no groove at the tip of the scutellum. The auxiliary yein 

 moreover, terminates distinctly beyond the anterior cross-vein. 



2. Pipiza (Pipizella) bellula, sp . n ., <? . 



AnteunaBelongate ; wings with a brownish spot, the last sectiou of the fourth vein nearly straight ■ le*s hlaek 

 Eyes hght-pxlose Proutal triaugle shiuing metaUic black, with erect black pile ; fl sSg bhfck ^ t 

 black pne, m profile w.th a shght convexity above the middle. Antenn* black ; third joS ful y Z ice 



