OF NATURAL HISTORY. 745 



The basal series of transverse nervures is very sli-htly dis- 

 located. ° 



3. P. BIGUTTATUS Fabr.— The individual described by Fabri- 

 cius appears to be a female. Coquebert gives its length at nine- 

 twentieths of an inch, but it sometimes exceeds half an inch in 

 length. The male is over three-tenths of an inch in length ; it 

 is destitute of the anterior white striga of the thorax, and "the 'tip 

 of the tergum has a white reflection; the posterior half of the 

 metathorax also has a white reflection. The basal series of trans- 

 verse nervures is not dislocated, in this species. 



4. P. LEPIDUS. — Black; abdomen and wings purplish. [304] 

 Inhabits Mexico. 



I Body black, slightly sericeous : wings dark purplish ; sec- 

 ond and third cubital cellules a little narrowed at the radial cel- 

 lule, particularly the latter, which is less than two-thirds the 

 length of the second cellule, in that part; basal series of trans- 

 verse nervures not dislocated ; metathorax with a very slight re- 

 flection of purplish, and without any impressed line ; the poste- 

 rior edge obviously reflected ; tergum with a distinct purplish re- 

 flection ; beneath black ; in a favorable light a very slight pur- 

 plish reflection may be perceived on the thighs. 



Length two-fifths of an inch. 



5. P. 5-NOTATUS. — Tergum on the second segment with two 

 white spots ; third segment with a white interrupted band. 



Inhabits Indiana. 



5 Body black ; head with a slight white reflection before ; and 

 a very slender white line on the posterior orbit : wings on the 

 apical margin black ; basal series of transverse nervures not dis- 

 located ; tergum with a white dot each side before the middle, on 

 the second segment : third segment with a white, interrupted 

 band at base, on the fourth segment at base is an obsolete, whit- 

 ish spot each side, sometimes wanting ; anal segment with a white 

 spot at base. 



Length two-fifths of an inch. 



Resembles higuttatus Fabr., but is distinguished by the two or 

 four more white spots on the tergum, as well as by the white spot 

 on the anal segment. 

 1835.] 



