OF PHILADELPHIA. 71 



Inhabits Missouri. 



Body deep black ; head elongated; antennas black, basal joint 

 pale ; eyes oblong-oval ; thorax pale rufous, a transverse, unin- 

 terrupted series of approximate acute spines on the collar, and a 

 series of rather smaller ones over the insertion of the anterior 

 feet ; wings whitish with a distinct black spot on the middle of 

 the costal margin ; feet black, trochanters and middle of the 

 thighs pale rufous; anterior tibia with a series of prominent 

 acute spines, on the anterior middle and tip, spines piceous at 

 tip. 



Length one-quarter of an inch nearly. 



Taken at Engineer Cantonment. 



2. D. SPINIPES. — Black; stcthidium and thighs rufous; two 

 series of spines on the thorax of which the anterior one is inter- 

 rupted in the middle ; wings fuscous. 



Inhabits Missouri. 



Body black ; head elongated ; thorax pale rufous, a transverse 

 series of approximate spines on the collar interrupted in the 

 middle, and a series of smaller ones over the insertion of the an- 

 terior feet ; wings blackish, costal margin darker ; feet black, 

 thighs and basal joints of the anterior pairs pale rufous; anterior 

 tibia with a series of acute prominent spines near the base, mid- 

 dle and at tip. 



Length from the eyes to tip of the wings three-tenths of an 

 inch. 



Found near Fort Osage. 



Differs from the preceding species in being much larger, in 

 having the anterior series of thoracic spines [80] interrupted in 

 the middle, and in having a triple series of spines on the ante- 

 rior tibia. 



3. D. THORAClcus. — Black; stethidium, and two anterior pairs 

 of thighs pale rufous ; anterior series of thoracic spines uninter- 

 rupted. 



Inhabits Pennsylvania and Maryland. 



Thoracic spines, scutel and metathorax black ; pleura and 

 pectus, excepting the incisures, black ; wings fuscous, stigma 

 darker; poisers black ; anterior coxse and thighs, excepting the 

 basal and apical incisures, pale rufous ; intermediate thighs, ex- 

 1823.] 



