222 



PSYCHE. 



[July, 1901 



(figs.'9-ii) live sixtlis as long as tlie denies, 

 lanceolate from the side, linear from above, 

 senate with entire apex. Head and body 

 naked, excepting a few stiff anal setae; ap- 

 pendages sparsely clothed with minute still 

 setae. Maxininm length, o.^(> mm. 



Described from twenty-one types, some 

 of which have been given to the Museum 

 of Comparative Zoology at Cambridge, 

 Mass. 



Explanation of Plate II. 



Fig. ,1. Left aspect of left bind leg, X iiS. 

 Fig. 2. Diagram of a sagittal section show- 



ing the peculiar alimentary canal of the 

 genus, X 118. 



Neelus mt'iiu/iis, n. sp. 



Fig. 3. Lateral aspect, X 1-2. 



Fig. 4. Lateral view of left antenna, X 

 506. 



Fig. 5. Right aspect of right fore foot, X 

 looS. 



Fig. 6. Right aspect of right hind foot, X 

 1008. 



Fig. 7. \'entral tube as seen from the left 

 side, X 269. 



Fig. 8. Ventral tube showing ei^sertile 

 papillae, X 44S. 



Fig. 9. Furcula. X 269. 



Fig. 10. Furcula, from above, X 224. 



Fig. II. Right aspect of left nnicro, X ^105. 



MICRODON LARVAE IN PSEUDOMYRMA NESTS.* 



BY WILLIAM MORTON WHEELER, AUSTIN, TEXAS. 



The larvae of the Syrphid Hies belong- 

 ing to the genus Microdon are of pecul- 

 iar interest to the entomologist both on 

 account of their occurrence in ant nests 

 and because of their remarkable appear- 

 ance which is more like that of slugs, 

 planarians or scale-insects than Dipteron 

 larvae. In Europe they have long been 

 known to occur in the nests of several 

 Formicidae and even in the nests of 

 Vespa crabro.t 



* Contributions from the Zoological Laboratory of the 

 University of Texas, No. 20. 



tWasmann. Vergleichende Studien ueber Ameisen 

 gaeste uud Termitengaeste Tijdschr.voor Eutomol, Bd. 33, 

 iSgo. 



WasmannJ records the occurrence of 

 the larva and pupa of Microdon mutabilis 

 L. with Fonniia fiisca, F. ni/it, F. nifi- 

 /loii'is, Lasii/s /ligi'r, L. hrniiiinis ami I.. 

 ffitv?is, and of ^Ficrotlon ilt-vius L. with F. 

 fiista, F. sangiiinca, F. nifa and L. fuligi- 

 nosns. Adlerz§ found a species in the 

 nest of Camponottis henuleanus. In the 

 United States Microdon larvae are occa- 

 sionally found with Caniponotm p,-nns\l- 

 vanicus and Formica inlcgra, and a care- 



J: Kritiches Verzeichniss derniyrmekophilen und termito- 

 phileu ."Xrthropoden. Berlin iS()4 pp. 173 and 175. 

 § Myrniecologlsker Notiser. EDtoniol. Tidskrift i8g6 pp. 



i3"->32) 



