282 DIPTERA FROM SOUTHWESTERN UNITED STATES 



in having the antennae much longer and the third joint acute at 

 apex on upper side. The European species is entirely black, 

 whereas the new one is testaceous. 



From all other genera in Coenosiinae Allognotha may be sep- 

 arated by the discontinuance of costa at apex of third vein. 



Allognotha semivitta sp. n. 



Ma'e and Female. — Yellowish testaceous, opaque. Head paler than rest 

 of body, the face nearly white; center portion of occiput grayish. Thorax 

 sometimes entirely yellow, but normally with graj- or fuscous markings as 

 follows: Dorsum with four vittae, the outer pair ver}' short, not extending 

 cephalad of the suture, the median pair extending from anterior margin to 

 penultimate pair of dorso-centrals, postnotum with center broadly dark, 

 mesopleura, stemopleura and hypopleura each with a large dark spot. Legs 

 entirely testaceous, "\^'ings clear, veins yellow. 



Frons slightly less than one-third the width of liead, rounded in profile; 

 ocellar bristles very strong; orbitals three to four, antennae short, not extend- 

 ing much below middle of face; eyes decidedly divergent below; face vertical; 

 parafacials distinct in jirofile, of equal width throughout their length; vibrissae 

 strong; mouth margin with six to nine strong black bristles; arista with 

 short hairs. Presutural acrostichals irregularly two-rowed; scutellum with 

 four strong bristles. Legs with bristles arranged as in normal Coenosia species, 

 but rather shorter and stouter. Hypopygium small; fifth sternite with a deep 

 central incision, dividing the segment into two long processes. Veins 3 and 4 

 distinctl}^ divergent at apices. Length, 3 to 4.5 mm. 



Type. — cf ; Meredosia, Illinois, August 19, 1917, [Illinois]. 

 Paratypes.—2 9 , topotypical. May 29; 2 a^, 1 9 , Havana, Illi- 

 nois, August 30 to 31; 1 9 , labelled ''N. 111." 



The specimens with the exception of the last one were taken 

 by IMr. C. A. Hart and the writer in 1917. while collecting in the 

 sand regions at the two places named. 



The species bears a strong resemblance to Coenosia modesta 

 Loew, which is, however, a true Coenosia. 



The type is in the collection of the State Natural History Sur- 

 vey of Illinois, and a paratype is deposited in the Academj^ of 

 Natural Sciences of Philadelphia. 



Coenosia fraterna sp. n. 



Male and Female. — Black, shghtly shining. Head black, frons, face, 

 cheeks, and apex of second antennal joint whitish gray pruinose; antennae, 

 proboscis and palpi black. Thorax whitish pruinescent, with three faint 

 brown vittae. Abdomen colored as thorax, with a pair of brown spots on 

 dorsum of segments two, three and four. Legs black, bases of tibia reddish, 

 more broadh' so in female. Wings clear. Cah-ptra white. Halteres yellow- 

 ish. 



