THE OLFACTORY ORGANS OF DIPTERA 467 
TABLE 1—Continued 
TYPE 
*Nos. Nos. 33 Total 
NUMBER AND NAMES OF SPECIES ene Basal Seealecl 34 anak 
Py pores 
Num-| Num-| Num-| Num-} Num-} Num-| Num- 
ber of|ber of|ber of|ber of|ber of|ber of|ber of 
groups} pores |groups| pores |groups} pores | pores 
37. Musca domestica o’........... 4 SON LSS! Ih AsealeSes ih en GOOG 
38. Musca domestica 9........... 4 Sol te) G6l | 48 lS oOr alee aoe 
39. Sarcophaga plinthopyga....... 2 18; )'2) |:140.) 4) le3k6 A74 
40. Sarcophaga lambens...........| 2 32 | 2 |168] 4 | 334 534 
41. Sarcophaga helicis.............| 4 48} 2 | 186) 4 | 826| 4 | 564 
42 warcophaga sp:ss.. 440. 4: Sees SR + 36 | 2 | 146) 4 | 292 474 
43. Sarcophaga.sp.....¢.2.... 0048 4 34] 2 | 150] 4 | 334 518 
44. Olfersia americana c.....‘....| 2 605) Ame) 2425 | 25 e304 
45. Melophagus ovinus 9......... ij 
46. Lipoptena depressa o..‘...... 2 LOS ee 68 | 4 | 122 200 
47. Hippoboscea struthinionis o...| 2 TGS Zo 120 ra 3045 2 442 
48. Nycteribia bellardii o........ 2 6 2 3G) | 2 44° 
A eres LO 0) 0 O=) 2) 26) 6-|os— 
SVL en nennetetics onan RSet dees 4g| 2 |272| 4 | 552!1 6 | 870 
* These numbers refer to those in figure 3, showing the same types on the halteres 
of the house fly. 
+ Halteres totally wanting. 
the legs is slightly more than might be expected; 2) the wing is 
nothing more than a little pad, about as long as the base of the 
halter, but it bears no pores; 3) the halteres seem normal in size, 
but the pores on them are comparatively few in number, the 
Hicks’ and basal groups being absent; 4) the ovipositor seems to 
bear 21 small.pores, but they are not recorded in the tables. 
The chitinous parts of the genital organs of all the abnormal 
species and of a few of the normal species were examined, but no 
olfactory pores were observed on them except as above stated. 
The so-called wingless female phorid (13 Pulicifora borinquensis) 
is the smallest specimen examined. The wing is padlike, about 
the size of the halter and it bears 7 pores. The number of pores 
on the halter appears to be reduced. The deer tick (46 Lipop- 
tena depressa) has vestigial wings which are unusually thick 
