PERLIDES. 171 



100. PERLA OPPOSITA. 



Nigra, nitens, ferrugineo varia ; caput antice testaceum, thorace 

 vix latins ; prothorax antice non latins, disco ruguloso, lateri- 

 bus marginatis rectis, angulis sat acutis ; scutellum flavo ma- 

 culatum ; alee subcinerece, ad venas transversas obscuriores. 



Black, shining, partly ferruginous : head testaceous in front, 

 hardly hroader than the thorax : antennae very minutely pubescent : 

 prothorax minutely punctured, rugulose on the disk, not broader in 

 front, with a rim on each side and along the fore border ; sides 

 straight ; angles rather sharp : scutellum with a yellow spot in 

 front : wings very slightly gray, darker about the transverse veins ; 

 veins black. Length of the body 4i lines ; of the wings 13 lines. 



a, b. Van Dieman's Land. From Dr. Hooker's collection. 



c. Van Dieman's Land. From Mr. Smith's collection. 



d. New Zealand. Presented by Capt. J. C. Ross. 



Sub-genus 6. ISOPTERYX. 



Alarum posticarum regio analis vix ulla. 

 Anal region of the hind-wings almost wanting. 

 Isopteryx, Pictet, Hist. Nat. Neur. Perl. 146, 6. 

 Species yellow, of small size. 



Div. 1. 



Antennae serratae. Prothorax maculis duabus magnis fuscis. 



101. PERLA SERRICORNIS. 



Perla serricornis, Pictet, Hist. Nat. Neur. Perl. 303, 64, pi. 36, f. 

 13. 



Germany. 



