434 PROVEEDINQS OF THE NATIONAL MUSEUM^ vol. o4. 



sized at this time. The mesonotum is distinctly divided into three 

 transverse areas. The pronotum is pushed far forward between the 

 eyes. The metathoracic scutum is not divided by praescutum and 

 scutelhmi. Parascutellum is completely separated from scutum. 



The pleural plates of the prothorax and mesothorax are conspicu- 

 ous, and ventrally are united with the eusternum. The sternellum 

 is, as usual, longitudinally strongly marked on the median line. 

 The front and middle trochanters are normally elongate. 



The metathoracic pleurae are greatly twisted. The prelare is a 

 large piece indistinctly separated from the lower lobe of the epister- 

 num (lateropleurite). The epimeron is narrow in front but very 

 large in the hypoepimeral zone. The pleural suture is very sinuous 

 and reaches the coxae. Episternum does not come near the coxae, 

 being terminated as usual in this order, far forward. The sternum is 

 indistinctly marked into two areas. The coxa is large and bears a 

 very small trochanter. The hind femora are short and broad. 



VI. Family STYLOPIDAE Kirby. 



As now characterized, the family Stylopidae has in the male six- 

 jointed antennae, with only the third joint laterally produced ; four- 

 jointed tarsi without claws; metathoracic praescutum extending be- 

 tween scuti but not always separating them; postlumbium rather 

 large; parascutellum distinct; and in the female, five genital tubes, 

 distinct mandibles, distinct spiracles. 



The following genera and subgenera are included : 



Stylops Kirby 1802, type, melittae Kirb}'^ ; 50 species. 



Subgenus Stylops Kirby; 48 species. 



Subgenus Katastylops Pierce, type, folennonii Pierce ; 1 species. 



Subgenus Prof<tylops Pierce, type, pilipedis Pierce ; 1 species. 



Neostylops Pierce, type, crawfordi Pierce ; 5 species. 



Parastylops Meijere 1908, type, fiagellatus Meigere; 1 species. 



Table of genera of Stylopidae (Males). 



1. Metathoracic scutum not divided by praescutum aud scutellum 2. 



Metathoracic scutum divided by praescutum and scutellum; antennae short 



and robust 11. Stylops Kirby. 



2. Antennae short and robust 12. Neostylops Pierce. 



Antennae attenuate ■. 13. Parastylops Meijere. 



Tabic of species of female Stylopidae. 



1. (a) Spiracles not reaching margin 2. 



(6) Spiracles reaching margin 3. 



2. (a) Mandibles with an apical tooth and a strong lateral tooth near base; 



base of head 0.61 as wide as cephalothorax at spiracles ; distance 

 from spiracles to apex 0.71 the breadth at spiracles (Stylops, 

 group 1 ) bipunctatae. 



